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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2012	Oct. 25, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	Proto Labs Inc
Entity Central Index Key	0001443669
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		24,325,937

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 36,290	$ 8,135
Short-term marketable securities	21,704	250
Accounts receivable, net of allowance for doubtful accounts of $158 and $97 as of September 30, 2012 and December 31, 2011, respectively	15,304	11,533
Inventory	4,343	3,797
Prepaid expenses and other current assets	3,997	3,430
Deferred tax assets	930	932
Income tax receivable	245
Total current assets	82,813	28,077
Property and equipment, net	44,457	34,249
Long-term marketable securities	29,651
Total assets	156,921	62,326
Current liabilities
Accounts payable	4,159	4,431
Accrued compensation	5,516	4,767
Accrued liabilities and other	725	318
Income taxes payable		33
Current portion of long-term debt obligations	335	390
Total current liabilities	10,735	9,939
Deferred tax liability	4,252	4,252
Long-term debt obligations	401	613
Other	800	871
Shareholders' equity (deficit)
Preferred stock, $0.001 par value, authorized 10,000,000 and 0 shares; issued and outstanding 0 shares as of September 30, 2012 and December 31, 2011, respectively
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 24,302,437 and 9,706,270 shares as of September 30, 2012 and December 31, 2011, respectively	24	10
Additional paid in capital	138,075	8,229
Accumulated equity (deficit)	3,175	(27,744)
Accumulated other comprehensive income (loss)	(541)	(738)
Total shareholders' equity (deficit)	140,733	(20,243)
Total liabilities, redeemable convertible preferred stock, redeemable common stock and shareholders' equity (deficit)	$ 156,921	62,326
Redeemable Convertible Preferred Stock
Redeemable convertible stock
Redeemable Stock		66,075
Redeemable Common Stock
Redeemable convertible stock
Redeemable Stock		$ 819

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts	$ 158	$ 97
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	24,302,437	9,706,270
Common stock, shares outstanding	24,302,437	9,706,270
Redeemable Convertible Preferred Stock
Redeemable stock, par value	$ 0.001	$ 0.001
Redeemable stock, Shares authorized	0	427,985
Redeemable stock, shares issued	0	427,985
Redeemable stock, shares outstanding	0	427,985
Redeemable Common Stock
Redeemable stock, par value	$ 0.001	$ 0.001
Redeemable stock, shares issued	0	3,189,648
Redeemable stock, shares outstanding	0	3,189,648

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statements of Operations:
Revenue	$ 32,454	$ 26,915	$ 92,375	$ 73,302
Cost of revenue	12,760	10,305	37,242	28,251
Gross profit	19,694	16,610	55,133	45,051
Operating expenses
Marketing and sales	4,442	4,000	13,440	11,139
Research and development	2,561	1,304	6,622	3,639
General and administrative	3,118	3,038	10,394	8,297
Total operating expenses	10,121	8,342	30,456	23,075
Income from operations	9,573	8,268	24,677	21,976
Other income (expense), net	314	21	(90)	18
Income before income taxes	9,887	8,289	24,587	21,994
Provision for income taxes	3,185	2,801	7,957	7,252
Net income	6,702	5,488	16,630	14,742
Less: dividends on redeemable preferred stock		(1,053)		(3,126)
Less: undistributed earnings allocated to preferred shareholders		(1,415)		(3,834)
Net income attributable to common shareholders	$ 6,702	$ 3,020	$ 16,630	$ 7,782
Net income per share:
Basic	$ 0.28	$ 0.23	$ 0.72	$ 0.64
Diluted	$ 0.26	$ 0.22	$ 0.68	$ 0.58
Shares used to compute net income per share:
Basic	24,052,409	12,895,918	22,975,950	12,162,808
Diluted	25,312,643	13,560,400	24,356,785	13,496,238
Comprehensive income	$ 6,756	$ 5,182	$ 16,827	$ 14,462

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities
Net income	$ 16,630	$ 14,742
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,380	3,009
Stock-based compensation expense	2,362	742
Deferred taxes		1,463
Excess tax benefit from stock-based compensation	(2,635)
Loss (gain) on disposal of property and equipment		(11)
Changes in operating assets and liabilities:
Accounts receivable	(3,777)	(4,423)
Inventories	(513)	(1,252)
Prepaid expenses and other	(256)	(93)
Income taxes	2,350	524
Accounts payable	(312)	941
Accrued liabilities and other	1,032	3,693
Net cash provided by operating activities	19,261	19,335
Investing activities
Purchases of property and equipment	(14,435)	(10,083)
Purchases of marketable securities	(61,395)
Proceeds from sale of marketable securities	10,290	500
Net cash used in investing activities	(65,540)	(9,583)
Financing activities
Proceeds from initial public offering, net of offering costs	71,530
Payments on debt	(289)	(3,955)
Proceeds from exercises of warrants and stock options	728	547
Excess tax benefit from stock-based compensation	2,635
Net cash provided by (used in) financing activities	74,604	(3,408)
Effect of exchange rate changes on cash and cash equivalents	(170)	(92)
Net increase in cash and cash equivalents	28,155	6,252
Cash and cash equivalents, beginning of period	8,135	6,101
Cash and cash equivalents, end of period	$ 36,290	$ 12,353

Basis of Presentation

9 Months Ended

Sep. 30, 2012

Basis of Presentation [Abstract]

Basis of Presentation

Note 1 – Basis of Presentation

The unaudited interim Consolidated Financial Statements of Proto Labs, Inc. (Proto Labs, the Company, we, us or our) have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. These statements are unaudited but, in the opinion of management, reflect all adjustments necessary for a fair presentation of the Company’s statement of financial position, results of operations and cash flows for the periods presented. Except as otherwise disclosed herein, these adjustments consist of normal, recurring items. Operating results for interim periods are not necessarily indicative of results that may be expected for the fiscal year as a whole.

The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and the related disclosures at the date of the financial statements and during the reporting period. Actual results could materially differ from these estimates. For further information, refer to the audited consolidated financial statements and notes thereto included in the Company’s prospectus filed on February 27, 2012 with the SEC pursuant to Rule 424(b)(4) of the Securities Act of 1933.

The accompanying Consolidated Balance Sheet as of December 31, 2011 was derived from the audited Consolidated Financial Statements but does not include all disclosures required by U.S. GAAP for a full set of financial statements. This Form 10-Q should be read in conjunction with the Company’s Consolidated Financial Statements and Notes included in the prospectus filed on February 27, 2012 as referenced above.

On February 21, 2012, the Company executed a 14-for-1 forward stock split of the Company’s common stock. The consolidated financial statements for all periods and dates presented give retroactive effect to the stock split.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

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-Name Statement of Position (SOP)
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+ Details

Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2012

Recent Accounting Pronouncements [Abstract]

Recent Accounting Pronouncements

Note 2 – Recent Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS (ASU 2011-04). This accounting update generally aligns the principles for fair value measurements and the related disclosure requirements under U.S. GAAP and International Financial Reporting Standards (IFRS). From a U.S. GAAP perspective, the amendments are largely clarifications, but some could have a significant effect on certain companies. A number of new disclosures also are required. Except for certain disclosures, the guidance applies to public and nonpublic companies and is to be applied prospectively. For public and nonpublic companies, the amendments are effective during interim and annual periods beginning after December 15, 2011. The Company adopted this accounting guidance effective January 1, 2012. The adoption of ASU 2011-04 did not result in a material impact to the Company’s financial statements.

In June 2011, the FASB issued ASU 2011-05, Presentation of Comprehensive Income (ASU 2011-05). This accounting update requires entities to present items of net income and other comprehensive income either in a single continuous statement, or in separate, but consecutive, statements of net income and other comprehensive income. The new requirements do not change which components of comprehensive income are recognized in net income or other comprehensive income, or when an item of other comprehensive income must be reclassified to net income. However, the current option under existing standards to report other comprehensive income and its components in the statement of changes in equity is eliminated. In December 2011, the FASB issued ASU 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05 (ASU 2011-12). The updated guidance defers the requirement in ASU 2011-05 to present on the face of the financial statements the effects of reclassifications out of accumulated other comprehensive income on the components of net income and other comprehensive income. The amendments apply to public and nonpublic companies and are to be applied retrospectively. For public entities, the amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. The Company adopted this accounting guidance effective January 1, 2012 and has presented the items of net income and other comprehensive income in a single continuous statement in this report. The adoption of ASU 2011-05 and ASU 2011-12 did not result in a material impact to the Company’s financial statements.

- Definition

The entire disclosure for reporting accounting changes and error corrections. It includes the conveyance of information necessary for a user of the Company's financial information to understand all aspects and required disclosure information concerning all changes and error corrections reported in the Company's financial statements for the period.

+ References + Details

Net Income per Common Share

9 Months Ended

Sep. 30, 2012

Net Income per Common Share [Abstract]

Net Income per Common Share

Note 3 – Net Income per Common Share

Basic net income per share is computed based on the weighted-average number of common shares outstanding. Diluted net income per share is computed based on the weighted-average number of common shares outstanding, increased by the number of additional shares that would have been outstanding had the potentially dilutive common shares been issued and reduced by the number of shares the Company could have repurchased from the proceeds from issuance of the potentially dilutive shares. Potentially dilutive shares of common stock include stock options and other stock-based awards granted under stock-based compensation plans and shares committed to be purchased under the employee stock purchase plan.

The table below sets forth the computation of basic and diluted net income per share:


	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(in thousands, except share and per share amounts)	2012		2011			2012		2011
Net Income	$	6,702	$	5,488		$	16,630	$	14,742
Less: dividends on redeemable convertible preferred stock		—		(1,053	)		—		(3,126	)
Less: undistributed earnings allocated to preferred shareholders		—		(1,415	)		—		(3,834	)

Net income attributable to common shareholders	$	6,702	$	3,020		$	16,630	$	7,782

Basic—weighted-average shares outstanding:		24,052,409		12,895,918			22,975,950		12,162,808
Effect of dilutive securities:
Employee stock options, warrants and other		1,260,234		664,482			1,380,835		1,333,430

Diluted—weighted-average shares outstanding:		25,312,643		13,560,400			24,356,785		13,496,238

Net income per share attributable to common shareholders:
Basic	$	0.28	$	0.23		$	0.72	$	0.64

Diluted	$	0.26	$	0.22		$	0.68	$	0.58

Weighted-average diluted shares for the three and nine month periods ended September 30, 2011 excludes redeemable convertible preferred stock as it was anti-dilutive for the periods.

The following table sets forth the calculation of unaudited pro forma net income per basic and diluted share which gives effect to the conversion of all outstanding shares of redeemable convertible preferred stock as if the conversion had occurred on January 1, 2011:


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands, except share and per share amounts)	2012		2011		2012		2011
Net income attributable to common shareholders, as reported	$	6,702	$	3,020	$	16,630	$	7,782
Dividends on redeemable convertible preferred stock		—		1,053		—		3,126
Undistributed earnings allocated to preferred shareholders		—		1,415		—		3,834

Pro forma net income	$	6,702	$	5,488	$	16,630	$	14,742

Basic—weighted-average shares outstanding, as reported		24,052,409		12,895,918		22,975,950		12,162,808
Add: common shares from conversion of redeemable convertible preferred shares		—		5,991,790		—		5,991,790

Pro forma basic weighted average shares outstanding		24,052,409		18,887,708		22,975,950		18,154,598

Effect of dilutive securities:
Employee stock options and warrants		1,260,234		664,482		1,380,835		1,333,430

Pro forma diluted—weighted-average shares outstanding:		25,312,643		19,552,190		24,356,785		19,488,028

Pro forma net income per share attributable to common shareholders:
Basic	$	0.28	$	0.29	$	0.72	$	0.81

Diluted	$	0.26	$	0.28	$	0.68	$	0.76

Inventory

9 Months Ended

Sep. 30, 2012

Inventory [Abstract]

Inventory

Note 4 – Inventory

Inventory consists primarily of raw materials, which are recorded at the lower of cost or market using the average-cost method, which approximates first-in, first-out (FIFO) cost. The Company periodically reviews its inventory for slow-moving, damaged and discontinued items and provides allowances to reduce such items identified to their recoverable amounts.

The Company’s inventory consists of the following:


	September 30,			December 31,
(in thousands)	2012			2011
Raw materials	$	4,080		$	3,463
Work in process		347			418

Total Inventory		4,427			3,881
Allowance for obsolescence		(84	)		(84	)

Inventory, net of allowance	$	4,343		$	3,797

Marketable Securities

9 Months Ended

Sep. 30, 2012

Marketable Securities [Abstract]

Marketable Securities

Note 5 – Marketable Securities

The Company invests in short-term and long-term agency, municipal, corporate, commercial paper and other debt securities. The securities are categorized as held-to-maturity and are recorded at amortized cost. Categorization as held-to-maturity is based on the Company’s ability and intent to hold these securities to maturity. Information regarding the Company’s short-term and long-term marketable securities as of September 30, 2012 is as follows:


	September 30, 2012
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government agency securities	$	20,011	$	2	$	(1	)	$	20,012
Corporate debt securities		12,487		22		(8	)		12,501
Commercial paper		2,499		—		(5	)		2,494
U.S. municipal securities		11,662		3		(5	)		11,660
Certificates of deposit/time deposits		4,696		—		(4	)		4,692

Total marketable securities	$	51,355	$	27	$	(23	)	$	51,359

Fair values for the U.S. municipal and corporate debt securities are primarily determined based on quoted market prices (Level 1). Fair values for the U.S. government agency securities, certificates of deposit and commercial paper are primarily determined using dealer quotes or quoted market prices for similar securities (Level 2).

The Company tests for other than temporary losses on a quarterly basis and has considered the unrealized losses indicated above to be temporary in nature. The Company intends to hold the investments to maturity and recover the full principal.

Classification of marketable securities as current or non-current is based upon the security’s maturity date as of the date of these financial statements.

The September 30, 2012 balance of held-to-maturity debt securities by contractual maturity is shown in the following table at amortized cost. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.


	September 30,
(in thousands)	2012
Due in one year or less	$	21,704
Due after one year through three years		29,651

Total marketable securities	$	51,355

Fair Value Measurements

9 Months Ended

Sep. 30, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

Note 6 – Fair Value Measurements

Accounting Standards Codification (ASC) 820, Fair Value Measurement (ASC 820), defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820 also establishes a fair value hierarchy which requires classification based on observable and unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company’s cash consists of bank deposits. The Company’s cash equivalents measured at fair value as of September 30, 2012 consist of money market mutual funds and marketable securities with a maturity date of less than 90 days at the time of purchase. The Company’s short-term marketable securities measured at fair value as of December 31, 2011 consisted of domestic certificates of deposits at various banks and treasury notes. The Company determines the fair value of these investments using Level 1 inputs.

A summary of financial assets as of September 30, 2012 and December 31, 2011 measured at fair value on a recurring basis follows:


	September 30, 2012						December 31, 2011
(in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents
Money market mutual fund	$	14,756	$	—	$	—	$	—	$	—	$	—
U.S. municipal securities		3,670		—		—		—		—		—
Short-term marketable securities
Certificates of deposit and treasury notes		—		—		—		250		—		—

Total	$	18,426	$	—	$	—	$	250	$	—	$	—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

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-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details

Shareholders' Equity

9 Months Ended

Sep. 30, 2012

Shareholders' Equity [Abstract]

Shareholders' Equity

Note 7 – Shareholders’ Equity

Initial Public Offering

In February 2012, the Company issued 4.9 million shares of common stock (including the exercise of the underwriters’ over-allotment shares) in conjunction with its initial public offering (IPO). The public offering price of the shares sold in the offering was $16.00 per share. The total gross proceeds from the IPO to the Company were $79.1 million. After deducting underwriting discounts and commissions and offering expenses payable by the Company, the aggregate net proceeds received by the Company totaled approximately $71.5 million.

Immediately prior to the consummation of the IPO, all outstanding shares of redeemable convertible preferred stock and redeemable common stock were converted into shares of common stock. Shares of redeemable convertible preferred stock were converted into 5,991,790 shares of common stock. All previously accrued dividends on the preferred stock were released back into retained earnings. Shares of redeemable common stock were converted into 3,189,648 shares of common stock. Refer to the tables below for additional information regarding the conversion.

The following table presents equity transactions during the nine months ended September 30, 2012 (in thousands, except share data):


	Common Stock				Additional Paid-In			Accumulated			Accumulated Other Comprehensive
	Shares		Amount		Capital			Earnings (Deficit)			Income (Loss)			Total
Balance at December 31, 2011		9,706,270	$	10	$	8,229		$	(27,744	)	$	(738	)	$	(20,243	)
Common shares issued upon initial public offering		4,945,000		5		71,525			—			—			71,530
Common shares issued upon conversion of redeemable convertible preferred stock		5,991,790		6		66,069			—			—			66,075
Common shares issued upon conversion of redeemable common stock		3,189,648		3		816			—			—			819
Common shares issued on exercise of options and other		469,729		—		728			—			—			728
Excess tax benefit from stock option exercises		—		—		2,635			—			—			2,635
Preferred stock dividends		—		—		(14,289	)		14,289			—			—
Stock-based compensation expense		—		—		2,362			—			—			2,362
Net income		—		—		—			16,630			—			16,630
Other comprehensive income
Foreign currency translation adjustment		—		—		—			—			197			197

Total Comprehensive income															16,827

Balance at September 30, 2012		24,302,437	$	24	$	138,075		$	3,175		$	(541	)	$	140,733

Equity Incentive Plans

The Company has two equity incentive plans: the 2000 Stock Option Plan (2000 Plan) and the 2012 Long-Term Incentive Plan (2012 Plan). Upon the adoption of the 2012 Plan, all shares that were reserved under the 2000 Plan but not issued were assumed by the 2012 Plan. No additional shares will be issued under the 2000 Plan. Under the 2012 Plan, the Company has the ability to grant stock options, stock appreciation rights (SARs), restricted stock, stock units, other stock-based awards and cash incentive awards. Awards under the 2012 Plan will have a maximum term of ten years from the date of grant. The compensation committee may provide that the vesting or payment of any award will be subject to the attainment of specified performance measures in addition to the satisfaction of any continued service requirements and the compensation committee will determine whether such measures have been achieved. The per share exercise price of stock options and SARs granted under the 2012 Plan generally may not be less than the fair market value of a share of our common stock on the date of the grant.

Employee Stock Purchase Plan

The Company’s 2012 Employee Stock Purchase Plan (ESPP) became effective on February 23, 2012. The ESPP allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 15 percent of their eligible compensation, subject to plan limitations. The ESPP generally provides for six-month offering periods and at the end of each offering period, employees are able to purchase shares at 85 percent of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last trading day of the offering period. Due to the timing of the IPO, the initial offering period under the ESPP will run approximately eight-and-a-half months from the offering date of February 23, 2012 to November 15, 2012.

Stock-Based Compensation Expense

Stock-based compensation expense was $0.7 million and $0.3 million for the three months ended September 30, 2012 and 2011, and $2.4 million and $0.7 million for the nine months ended September 30, 2012 and 2011, respectively.

Stock Options

A summary of stock option activity for the nine months ended September 30, 2012 is as follows:


				Weighted-
				Average
	Stock Options			Exercise Price
Options outstanding at December 31, 2011		2,099,300		$	6.18
Granted		239,800			28.03
Exercised		(336,459	)		1.60
Cancelled		(500	)		30.58

Options outstanding at September 30, 2012		2,002,141		$	9.56

Exercisable at September 30, 2012		1,014,774		$	4.81

The outstanding options generally have a term of ten years. For employees, options granted become exercisable ratably over the vesting period, which is generally a 5-year period, beginning on the first anniversary of the grant date, subject to the employee’s continuing service to the Company. For directors, options generally become exercisable in full on the first anniversary of the grant date.

The weighted-average grant date fair value of options that were granted for the nine months ended September 30, 2012 was $14.44.

The following table provides the assumptions used in the Black-Scholes pricing model valuation of options:


	Nine months ended September 30,
	2012			2011
Risk-free interest rate		0.95 - 1.16	%		3.68	%
Expected life (years)		5.5 - 6.5			5.0
Expected volatility		53.00 - 53.14	%		47.32	%
Expected dividend yield		0	%		0	%

As of September 30, 2012 there was $5.8 million of total unrecognized compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 3.0 years.

Employee Stock Purchase Plan

The following table presents the assumptions used to estimate the fair value of the ESPP during the nine months ended September 30, 2012:


	Nine months ended September 30, 2012
Risk-free interest rate		0.16	%
Expected life (months)		8.5
Expected volatility		53.00	%
Expected dividend yield		0	%

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
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Reference 22: http://www.xbrl.org/2003/role/presentationRef
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Reference 23: http://www.xbrl.org/2003/role/presentationRef
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-Section 04
-Article 3

+ Details

Income Taxes

9 Months Ended

Sep. 30, 2012

Income Taxes [Abstract]

Income Taxes

Note 8 – Income Taxes

The Company is subject to income tax in multiple jurisdictions and the use of estimates is required to determine the provision for income taxes. For the three months ended September 30, 2012 and 2011 the Company recorded an income tax provision of $3.2 million and $2.8 million, respectively. For the nine months ended September 30, 2012 and 2011 the Company recorded an income tax provision of $8.0 million and $7.3 million, respectively. The income tax provision is based on the estimated annual effective tax rate for the year applied to pre-tax income. The effective income tax rate for the three months ended September 30, 2012 was 32.2 percent compared with 33.8 percent in the same period of the prior year. The effective income tax rate for the nine months ended September 30, 2012 was 32.4 percent compared with 33.0 percent in the same period of the prior year.

The effective income tax rate for the three and nine month periods ended September 30, 2012 differs from the U.S. federal statutory rate of 35 percent primarily due to the components of income.

The Company has liabilities related to unrecognized tax benefits totaling $0.4 million at September 30, 2012 and December 31, 2011 that if recognized would result in a reduction of the Company’s effective tax rate. There were no material adjustments to the unrecorded tax benefits during the three or nine month periods ended September 30, 2012, and the Company does not anticipate that total unrecognized tax benefits will materially change in the next twelve months. The Company recognizes interest and penalties related to income tax matters in income tax expense, and reports the liability in current or long-term income taxes payable as appropriate.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

+ Details

Segment and Geographic Information

9 Months Ended

Sep. 30, 2012

Segment Information/Geographic Information [Abstract]

Segment and Geographic Information

Note 9 – Segment and Geographic Information

The Company’s operations are comprised of three geographically-based operating segments in the United States, Europe and Japan included in the reportable segments of United States, Europe and Other. Each operating segment generates revenue by providing low-volume custom parts to product developers worldwide. Operations included in the category “Other” are not considered significant.

Certain operating expenses and total assets managed by the Company on a global basis are included in the United States segment. As a result, reportable segment income from operations is not representative of the income from operations of the geographies in the reportable segments.

Revenue, income from operations, depreciation and amortization, provision for income taxes, capital expenditures and total assets by segment are as follows:


	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2012			2011			2012			2011
Revenue:
United States	$	25,582		$	20,287		$	72,652		$	57,510
Europe		5,771			5,790			16,305			13,941
Other		1,101			838			3,418			1,851

Consolidated	$	32,454		$	26,915		$	92,375		$	73,302

Income from operations:
United States	$	8,362		$	6,701		$	22,396		$	20,089
Europe		1,995			2,104			4,706			3,672
Other		(784	)		(537	)		(2,425	)		(1,785	)

Consolidated	$	9,573		$	8,268		$	24,677		$	21,976

Depreciation and amortization:
United States	$	1,261		$	807		$	3,360		$	2,126
Europe		250			273			722			747
Other		101			47			298			136

Consolidated	$	1,612		$	1,127		$	4,380		$	3,009

Provision for income taxes:
United States	$	2,990		$	2,435		$	7,420		$	6,612
Europe		195			366			537			640
Other		—			—			—			—

Consolidated	$	3,185		$	2,801		$	7,957		$	7,252

Capital expenditures:
United States	$	1,371		$	3,301		$	11,196		$	8,302
Europe		377			450			1,706			1,425
Other		23			(18	)		1,533			356

Consolidated	$	1,771		$	3,733		$	14,435		$	10,083


(in thousands)	September 30, 2012		December 31, 2011
Total assets:
United States	$	139,438	$	47,710
Europe		12,089		10,719
Other		5,394		3,897

Consolidated	$	156,921	$	62,326

The Company’s revenue is derived from its Protomold injection molding and Firstcut computer numerical control (CNC) machining product lines. Total revenue by product line is as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2012		2011		2012		2011
Revenue:
Protomold	$	23,458	$	19,951	$	66,697	$	55,087
First Cut		8,996		6,964		25,678		18,215

Total revenue	$	32,454	$	26,915	$	92,375	$	73,302

Revenue to external customers based on the billing location of the end user customer and long-lived assets by geographic region are as follows:


	Three months ended September 30,				Nine months ended September 30,
(in thousands)	2012		2011		2012		2011
Revenue:
United States	$	24,807	$	19,434	$	69,887	$	54,723
International
Europe		5,771		5,790		16,305		13,941
Other		1,876		1,691		6,183		4,638

Total international		7,647		7,481		22,488		18,579

Total revenue	$	32,454	$	26,915	$	92,375	$	73,302


	September 30,		December 31,
(in thousands)	2012		2011
Long-lived assets:
United States	$	36,667	$	28,831
International
Europe		4,532		3,377
Other		3,258		2,041

Total international		7,790		5,418

Total long-lived assets	$	44,457	$	34,249

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Recent Accounting Pronouncements (Policies)	9 Months Ended
Recent Accounting Pronouncements (Policies)	Sep. 30, 2012
Recent Accounting Pronouncements [Abstract]
Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements	In May 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS (ASU 2011-04). This accounting update generally aligns the principles for fair value measurements and the related disclosure requirements under U.S. GAAP and International Financial Reporting Standards (IFRS). From a U.S. GAAP perspective, the amendments are largely clarifications, but some could have a significant effect on certain companies. A number of new disclosures also are required. Except for certain disclosures, the guidance applies to public and nonpublic companies and is to be applied prospectively. For public and nonpublic companies, the amendments are effective during interim and annual periods beginning after December 15, 2011. The Company adopted this accounting guidance effective January 1, 2012. The adoption of ASU 2011-04 did not result in a material impact to the Company’s financial statements.
Presentation of Comprehensive Income	In June 2011, the FASB issued ASU 2011-05, Presentation of Comprehensive Income (ASU 2011-05). This accounting update requires entities to present items of net income and other comprehensive income either in a single continuous statement, or in separate, but consecutive, statements of net income and other comprehensive income. The new requirements do not change which components of comprehensive income are recognized in net income or other comprehensive income, or when an item of other comprehensive income must be reclassified to net income. However, the current option under existing standards to report other comprehensive income and its components in the statement of changes in equity is eliminated.
Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income	In December 2011, the FASB issued ASU 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05 (ASU 2011-12). The updated guidance defers the requirement in ASU 2011-05 to present on the face of the financial statements the effects of reclassifications out of accumulated other comprehensive income on the components of net income and other comprehensive income. The amendments apply to public and nonpublic companies and are to be applied retrospectively. For public entities, the amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. The Company adopted this accounting guidance effective January 1, 2012 and has presented the items of net income and other comprehensive income in a single continuous statement in this report. The adoption of ASU 2011-05 and ASU 2011-12 did not result in a material impact to the Company’s financial statements.

Net Income per Common Share (Tables)

9 Months Ended

Sep. 30, 2012

Net Income per Common Share [Abstract]

Computation of basic and diluted net income per share

The table below sets forth the computation of basic and diluted net income per share:


	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(in thousands, except share and per share amounts)	2012		2011			2012		2011
Net Income	$	6,702	$	5,488		$	16,630	$	14,742
Less: dividends on redeemable convertible preferred stock		—		(1,053	)		—		(3,126	)
Less: undistributed earnings allocated to preferred shareholders		—		(1,415	)		—		(3,834	)

Net income attributable to common shareholders	$	6,702	$	3,020		$	16,630	$	7,782

Basic—weighted-average shares outstanding:		24,052,409		12,895,918			22,975,950		12,162,808
Effect of dilutive securities:
Employee stock options, warrants and other		1,260,234		664,482			1,380,835		1,333,430

Diluted—weighted-average shares outstanding:		25,312,643		13,560,400			24,356,785		13,496,238

Net income per share attributable to common shareholders:
Basic	$	0.28	$	0.23		$	0.72	$	0.64

Diluted	$	0.26	$	0.22		$	0.68	$	0.58

Calculation of unaudited pro forma net income per basic and diluted share


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands, except share and per share amounts)	2012		2011		2012		2011
Net income attributable to common shareholders, as reported	$	6,702	$	3,020	$	16,630	$	7,782
Dividends on redeemable convertible preferred stock		—		1,053		—		3,126
Undistributed earnings allocated to preferred shareholders		—		1,415		—		3,834

Pro forma net income	$	6,702	$	5,488	$	16,630	$	14,742

Basic—weighted-average shares outstanding, as reported		24,052,409		12,895,918		22,975,950		12,162,808
Add: common shares from conversion of redeemable convertible preferred shares		—		5,991,790		—		5,991,790

Pro forma basic weighted average shares outstanding		24,052,409		18,887,708		22,975,950		18,154,598

Effect of dilutive securities:
Employee stock options and warrants		1,260,234		664,482		1,380,835		1,333,430

Pro forma diluted—weighted-average shares outstanding:		25,312,643		19,552,190		24,356,785		19,488,028

Pro forma net income per share attributable to common shareholders:
Basic	$	0.28	$	0.29	$	0.72	$	0.81

Diluted	$	0.26	$	0.28	$	0.68	$	0.76

Inventory (Tables)

9 Months Ended

Sep. 30, 2012

Inventory [Abstract]

Summary of Inventory

The Company’s inventory consists of the following:


	September 30,			December 31,
(in thousands)	2012			2011
Raw materials	$	4,080		$	3,463
Work in process		347			418

Total Inventory		4,427			3,881
Allowance for obsolescence		(84	)		(84	)

Inventory, net of allowance	$	4,343		$	3,797

Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2012

Marketable Securities [Abstract]

Summary of the amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current)


	September 30, 2012
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government agency securities	$	20,011	$	2	$	(1	)	$	20,012
Corporate debt securities		12,487		22		(8	)		12,501
Commercial paper		2,499		—		(5	)		2,494
U.S. municipal securities		11,662		3		(5	)		11,660
Certificates of deposit/time deposits		4,696		—		(4	)		4,692

Total marketable securities	$	51,355	$	27	$	(23	)	$	51,359

Summary of held-to-maturity debt securities by contractual maturity at amortized cost


	September 30,
(in thousands)	2012
Due in one year or less	$	21,704
Due after one year through three years		29,651

Total marketable securities	$	51,355

- Definition

Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5086-111524

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measurements [Abstract]

Summary of financial assets, measured at fair value on a recurring basis

A summary of financial assets as of September 30, 2012 and December 31, 2011 measured at fair value on a recurring basis follows:


	September 30, 2012						December 31, 2011
(in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Financial Assets:
Cash and cash equivalents
Money market mutual fund	$	14,756	$	—	$	—	$	—	$	—	$	—
U.S. municipal securities		3,670		—		—		—		—		—
Short-term marketable securities
Certificates of deposit and treasury notes		—		—		—		250		—		—

Total	$	18,426	$	—	$	—	$	250	$	—	$	—

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2012

Shareholders' Equity [Abstract]

Summary of equity transactions related to the IPO

The following table presents equity transactions during the nine months ended September 30, 2012 (in thousands, except share data):


	Common Stock				Additional Paid-In			Accumulated			Accumulated Other Comprehensive
	Shares		Amount		Capital			Earnings (Deficit)			Income (Loss)			Total
Balance at December 31, 2011		9,706,270	$	10	$	8,229		$	(27,744	)	$	(738	)	$	(20,243	)
Common shares issued upon initial public offering		4,945,000		5		71,525			—			—			71,530
Common shares issued upon conversion of redeemable convertible preferred stock		5,991,790		6		66,069			—			—			66,075
Common shares issued upon conversion of redeemable common stock		3,189,648		3		816			—			—			819
Common shares issued on exercise of options and other		469,729		—		728			—			—			728
Excess tax benefit from stock option exercises		—		—		2,635			—			—			2,635
Preferred stock dividends		—		—		(14,289	)		14,289			—			—
Stock-based compensation expense		—		—		2,362			—			—			2,362
Net income		—		—		—			16,630			—			16,630
Other comprehensive income
Foreign currency translation adjustment		—		—		—			—			197			197

Total Comprehensive income															16,827

Balance at September 30, 2012		24,302,437	$	24	$	138,075		$	3,175		$	(541	)	$	140,733

Summary of stock option activity

A summary of stock option activity for the nine months ended September 30, 2012 is as follows:


				Weighted-
				Average
	Stock Options			Exercise Price
Options outstanding at December 31, 2011		2,099,300		$	6.18
Granted		239,800			28.03
Exercised		(336,459	)		1.60
Cancelled		(500	)		30.58

Options outstanding at September 30, 2012		2,002,141		$	9.56

Exercisable at September 30, 2012		1,014,774		$	4.81

Summary of assumptions used in the Black-Scholes pricing model valuation of options

The following table provides the assumptions used in the Black-Scholes pricing model valuation of options:


	Nine months ended September 30,
	2012			2011
Risk-free interest rate		0.95 - 1.16	%		3.68	%
Expected life (years)		5.5 - 6.5			5.0
Expected volatility		53.00 - 53.14	%		47.32	%
Expected dividend yield		0	%		0	%

Summary of assumptions used to estimate the fair value of the ESPP

The following table presents the assumptions used to estimate the fair value of the ESPP during the nine months ended September 30, 2012:


	Nine months ended September 30, 2012
Risk-free interest rate		0.16	%
Expected life (months)		8.5
Expected volatility		53.00	%
Expected dividend yield		0	%

Segment and Geographic Information (Tables)

9 Months Ended

Sep. 30, 2012

Segment Information/Geographic Information [Abstract]

Revenue, income from operations, depreciation and amortization, provision for income taxes capital expenditures and total assets by segment

Revenue, income from operations, depreciation and amortization, provision for income taxes, capital expenditures and total assets by segment are as follows:


	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2012			2011			2012			2011
Revenue:
United States	$	25,582		$	20,287		$	72,652		$	57,510
Europe		5,771			5,790			16,305			13,941
Other		1,101			838			3,418			1,851

Consolidated	$	32,454		$	26,915		$	92,375		$	73,302

Income from operations:
United States	$	8,362		$	6,701		$	22,396		$	20,089
Europe		1,995			2,104			4,706			3,672
Other		(784	)		(537	)		(2,425	)		(1,785	)

Consolidated	$	9,573		$	8,268		$	24,677		$	21,976

Depreciation and amortization:
United States	$	1,261		$	807		$	3,360		$	2,126
Europe		250			273			722			747
Other		101			47			298			136

Consolidated	$	1,612		$	1,127		$	4,380		$	3,009

Provision for income taxes:
United States	$	2,990		$	2,435		$	7,420		$	6,612
Europe		195			366			537			640
Other		—			—			—			—

Consolidated	$	3,185		$	2,801		$	7,957		$	7,252

Capital expenditures:
United States	$	1,371		$	3,301		$	11,196		$	8,302
Europe		377			450			1,706			1,425
Other		23			(18	)		1,533			356

Consolidated	$	1,771		$	3,733		$	14,435		$	10,083


(in thousands)	September 30, 2012		December 31, 2011
Total assets:
United States	$	139,438	$	47,710
Europe		12,089		10,719
Other		5,394		3,897

Consolidated	$	156,921	$	62,326

Revenue by product line


	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2012		2011		2012		2011
Revenue:
Protomold	$	23,458	$	19,951	$	66,697	$	55,087
First Cut		8,996		6,964		25,678		18,215

Total revenue	$	32,454	$	26,915	$	92,375	$	73,302

Revenue to external customers based on the billing location of the end user customer and long-lived assets by geographic region

Revenue to external customers based on the billing location of the end user customer and long-lived assets by geographic region are as follows:


	Three months ended September 30,				Nine months ended September 30,
(in thousands)	2012		2011		2012		2011
Revenue:
United States	$	24,807	$	19,434	$	69,887	$	54,723
International
Europe		5,771		5,790		16,305		13,941
Other		1,876		1,691		6,183		4,638

Total international		7,647		7,481		22,488		18,579

Total revenue	$	32,454	$	26,915	$	92,375	$	73,302


	September 30,		December 31,
(in thousands)	2012		2011
Long-lived assets:
United States	$	36,667	$	28,831
International
Europe		4,532		3,377
Other		3,258		2,041

Total international		7,790		5,418

Total long-lived assets	$	44,457	$	34,249

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Basis of Presentation (Details Textual)	9 Months Ended
Basis of Presentation (Details Textual)	Sep. 30, 2012
Basis of Presentation (Textual) [Abstract]
Forward Stock Split Ratio for Common Stock	14

Net Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Computation of basic and diluted net income per share
Net income	$ 6,702	$ 5,488	$ 16,630	$ 14,742
Less: dividends on redeemable preferred stock		(1,053)		(3,126)
Less: undistributed earnings allocated to preferred shareholders		(1,415)		(3,834)
Net income attributable to common shareholders	$ 6,702	$ 3,020	$ 16,630	$ 7,782
Basic - weighted-average shares outstanding, as reported	24,052,409	12,895,918	22,975,950	12,162,808
Effect of dilutive securities:
Employee stock options, warrants and other	1,260,234	664,482	1,380,835	1,333,430
Diluted - weighted-average shares outstanding:	25,312,643	13,560,400	24,356,785	13,496,238
Net income per share attributable to common shareholders:
Basic	$ 0.28	$ 0.23	$ 0.72	$ 0.64
Diluted	$ 0.26	$ 0.22	$ 0.68	$ 0.58

Net Income per Common Share (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Calculation of unaudited pro forma net income per basic and diluted share
Net income attributable to common shareholders, as reported	$ 6,702	$ 3,020	$ 16,630	$ 7,782
Dividends on redeemable convertible preferred stock		1,053		3,126
Undistributed earnings allocated to preferred shareholders		1,415		3,834
Pro forma net income	$ 6,702	$ 5,488	$ 16,630	$ 14,742
Basic - weighted-average shares outstanding, as reported	24,052,409	12,895,918	22,975,950	12,162,808
Add: common shares from conversion of redeemable convertible preferred shares		5,991,790		5,991,790
Pro forma basic weighted - average shares outstanding	24,052,409	18,887,708	22,975,950	18,154,598
Effect of dilutive securities:
Employee stock options and warrants	1,260,234	664,482	1,380,835	1,333,430
Pro forma diluted - weighted-average shares outstanding:	25,312,643	19,552,190	24,356,785	19,488,028
Pro forma net income per share attributable to common shareholders:
Basic	$ 0.28	$ 0.29	$ 0.72	$ 0.81
Diluted	$ 0.26	$ 0.28	$ 0.68	$ 0.76

Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Summary of Inventory
Raw materials	$ 4,080	$ 3,463
Work in process	347	418
Total Inventory	4,427	3,881
Allowance for obsolescence	(84)	(84)
Inventory, net of allowance	$ 4,343	$ 3,797

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 8, 9, 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 9
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

+ Details

Marketable Securities (Details) $ in Thousands	9 Months Ended
Marketable Securities (Details) $ in Thousands	Sep. 30, 2012 USD ($)
Summary of the amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current)
Total marketable securities, Amortized Cost	$ 51,355
Marketable securities, Unrealized Gains	27
Total marketable securities, Unrealized Losses	(23)
Total marketable securities, Fair Value	51,359
U.S. government agency securities [Member]
Summary of the amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current)
Current marketable securities, Amortized Cost	20,011
Marketable securities, Unrealized Gains	2
Current marketable securities, Unrealized Losses	(1)
Current marketable securities, Fair Value	20,012
Corporate debt securities [Member]
Summary of the amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current)
Current marketable securities, Amortized Cost	12,487
Marketable securities, Unrealized Gains	22
Current marketable securities, Unrealized Losses	(8)
Current marketable securities, Fair Value	12,501
Commercial paper [Member]
Summary of the amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current)
Current marketable securities, Amortized Cost	2,499
Marketable securities, Unrealized Gains	0
Current marketable securities, Unrealized Losses	(5)
Current marketable securities, Fair Value	2,494
U.S. municipal securities [Member]
Summary of the amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current)
Current marketable securities, Amortized Cost	11,662
Marketable securities, Unrealized Gains	3
Current marketable securities, Unrealized Losses	(5)
Current marketable securities, Fair Value	11,660
Certificates of deposit/time deposits [Member]
Summary of the amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current)
Current marketable securities, Amortized Cost	4,696
Marketable securities, Unrealized Gains	0
Current marketable securities, Unrealized Losses	(4)
Current marketable securities, Fair Value	$ 4,692

Marketable Securities (Details 1) $ in Thousands	Sep. 30, 2012 USD ($)
Marketable Securities [Abstract]
Due in one year or less	$ 21,704
Due after one year through three years	29,651
Total marketable securities	$ 51,355

Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Level 1 [Member]
Cash and cash equivalents
Money market mutual fund	$ 14,756
Short-term marketable securities
Certificates of deposit and treasury notes		$ 250
Total	18,426	250
Level 1 [Member] \| U.S. municipal securities [Member]
Cash and cash equivalents
Cash and cash equivalents	3,670
Level 2 [Member]
Cash and cash equivalents
Money market mutual fund
Short-term marketable securities
Certificates of deposit and treasury notes
Total
Level 2 [Member] \| U.S. municipal securities [Member]
Cash and cash equivalents
Cash and cash equivalents
Level 3 [Member]
Cash and cash equivalents
Money market mutual fund
Short-term marketable securities
Certificates of deposit and treasury notes
Total
Level 3 [Member] \| U.S. municipal securities [Member]
Cash and cash equivalents
Cash and cash equivalents

Fair Value Measurements (Details Textual)	9 Months Ended
Fair Value Measurements (Details Textual)	Sep. 30, 2012
Fair Value Measurements (Textual) [Abstract]
Maturity date of money market mutual funds and marketable securities	less than 90 days

Shareholders' Equity (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
Shareholders' Equity (Details) - USD ($) $ in Thousands	Feb. 29, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of equity transactions for the period ended September 30, 2012
Beginning balance				$ (20,243)
Beginning balance, Shares				9,706,270
Common shares issued upon initial public offering				$ 71,530
Common shares issued upon initial public offering, shares	4,900,000
Common shares issued on exercise of options and other				$ 728
Common shares issued on exercise of options and other, shares				336,459
Excess tax benefit from stock option exercises				$ 2,635
Stock-based compensation expense				2,362
Net income		$ 6,702	$ 5,488	16,630	$ 14,742
Other comprehensive income
Foreign currency translation adjustments				197
Total Comprehensive income		6,756	$ 5,182	16,827	$ 14,462
Ending balance		$ 140,733		$ 140,733
Ending balance, Shares		24,302,437		24,302,437
Redeemable Convertible Preferred Stock [Member]
Summary of equity transactions for the period ended September 30, 2012
Common shares issued upon conversion				$ 66,075
Redeemable Common Stock [Member]
Summary of equity transactions for the period ended September 30, 2012
Common shares issued upon conversion				819
Common Stock [Member]
Summary of equity transactions for the period ended September 30, 2012
Beginning balance				$ 10
Beginning balance, Shares				9,706,270
Common shares issued upon initial public offering				$ 5
Common shares issued upon initial public offering, shares				4,945,000
Common shares issued on exercise of options and other, shares				469,729
Other comprehensive income
Ending balance		$ 24		$ 24
Ending balance, Shares		24,302,437		24,302,437
Common Stock [Member] \| Redeemable Convertible Preferred Stock [Member]
Summary of equity transactions for the period ended September 30, 2012
Common shares issued upon conversion				$ 6
Common shares issued upon conversion, shares				5,991,790
Common Stock [Member] \| Redeemable Common Stock [Member]
Summary of equity transactions for the period ended September 30, 2012
Common shares issued upon conversion				$ 3
Common shares issued upon conversion, shares				3,189,648
Additional Paid-In Capital [Member]
Summary of equity transactions for the period ended September 30, 2012
Beginning balance				$ 8,229
Common shares issued upon initial public offering				71,525
Common shares issued on exercise of options and other				728
Excess tax benefit from stock option exercises				2,635
Preferred stock dividends				(14,289)
Stock-based compensation expense				2,362
Other comprehensive income
Ending balance		$ 138,075		138,075
Additional Paid-In Capital [Member] \| Redeemable Convertible Preferred Stock [Member]
Summary of equity transactions for the period ended September 30, 2012
Common shares issued upon conversion				66,069
Additional Paid-In Capital [Member] \| Redeemable Common Stock [Member]
Summary of equity transactions for the period ended September 30, 2012
Common shares issued upon conversion				816
Accumulated Deficit [Member]
Summary of equity transactions for the period ended September 30, 2012
Beginning balance				(27,744)
Preferred stock dividends				14,289
Net income				16,630
Other comprehensive income
Ending balance		3,175		3,175
Accumulated Other Comprehensive Income (Loss) [Member]
Summary of equity transactions for the period ended September 30, 2012
Beginning balance				(738)
Other comprehensive income
Foreign currency translation adjustments				197
Ending balance		$ (541)		$ (541)

Shareholders' Equity (Details 1)	9 Months Ended
Shareholders' Equity (Details 1)	Sep. 30, 2012 $ / shares shares
Summary of stock option activity
Stock Options, Beginning balance \| shares	2,099,300
Weighted-Average Exercise Price, Beginning balance \| $ / shares	$ 6.18
Stock Options, Granted \| shares	239,800
Weighted-Average Exercise Price, Granted \| $ / shares	$ 28.03
Stock Options, Exercised \| shares	(336,459)
Weighted-Average Exercise Price, Exercised \| $ / shares	$ 1.60
Stock Options, Cancelled \| shares	(500)
Weighted-Average Exercise Price, Cancelled \| $ / shares	$ 30.58
Stock Options, Ending balance \| shares	2,002,141
Weighted-Average Exercise Price, Ending balance \| $ / shares	$ 9.56
Stock Options, Exercisable \| shares	1,014,774
Weighted-Average Exercise Price, Exercisable \| $ / shares	$ 4.81

Shareholders' Equity (Details 2)	9 Months Ended
Shareholders' Equity (Details 2)	Sep. 30, 2012	Sep. 30, 2011
Summary of assumptions used in the Black-Scholes pricing model valuation of options
Risk-free interest rate		3.68%
Expected life (years)		5 years
Expected volatility		47.32%
Expected dividend yield	0.00%	0.00%
Maximum [Member]
Summary of assumptions used in the Black-Scholes pricing model valuation of options
Risk-free interest rate	1.16%
Expected life (years)	6 years 6 months
Expected volatility	53.14%
Minimum [Member]
Summary of assumptions used in the Black-Scholes pricing model valuation of options
Risk-free interest rate	0.95%
Expected life (years)	5 years 6 months
Expected volatility	53.00%

Shareholders' Equity (Details 3)	9 Months Ended
Shareholders' Equity (Details 3)	Sep. 30, 2012	Sep. 30, 2011
Summary of assumptions used to estimate the fair value of the ESPP
Risk-free interest rate		3.68%
Expected life (months)		5 years
Expected volatility		47.32%
Expected dividend yield	0.00%	0.00%
Employee Stock [Member]
Summary of assumptions used to estimate the fair value of the ESPP
Risk-free interest rate	0.16%
Expected life (months)	8 years 6 months
Expected volatility	53.00%
Expected dividend yield	0.00%

Shareholders' Equity (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 29, 2012 USD ($) $ / shares shares	Sep. 30, 2012 USD ($) $ / shares	Sep. 30, 2011 USD ($)	Sep. 30, 2012 USD ($) Plan $ / shares shares	Sep. 30, 2011 USD ($)	Dec. 31, 2011 $ / shares
Stockholders' Equity (Additional Textual) [Abstract]
Plan with maximum term from the date of grant				10 years
Stockholders' Equity (Textual) [Abstract]
Common stock, shares issued \| shares	4,900,000
Common stock, shares issued price per share	$ 16.00
Gross proceeds from initial public offering \| $	$ 79,100			$ 71,530
Aggregate net proceeds received by the Company \| $	$ 71,500
Preferred stock, par value		$ 0.001		$ 0.001		$ 0.001
Common stock, par value		$ 0.001		$ 0.001		0.001
Number of equity incentive plans \| Plan				2
Percentage of discount on purchase price of share with fair market value				15.00%
ESPP generally provides offering periods				6 months
Percentage of purchase price of share with fair market value				85.00%
Due to the timing of the IPO, the initial offering period under the ESPP period				8 months 15 days
Due to the timing of the IPO, the initial offering period under the ESPP				February 23, 2012 to November 15, 2012
Stock-based compensation expense \| $		$ 700	$ 300	$ 2,362	$ 742
Options granted become exercisable ratably over the vesting period				5 years
Weighted average grant date fair value of options that were granted				$ 14.44
Total unrecognized compensation expense related to unvested stock options \| $		$ 5,800		$ 5,800
Total unrecognized compensation expense related to unvested stock options, expected to be recognized over a weighted average period				3 years
Redeemable Convertible Preferred Stock [Member]
Stockholders' Equity (Additional Textual) [Abstract]
Redeemable stock, par value		$ 0.001		$ 0.001		0.001
Shares of redeemable convertible preferred stock and redeemable common stock were converted into common stock \| shares				5,991,790
Redeemable Common Stock [Member]
Stockholders' Equity (Additional Textual) [Abstract]
Redeemable stock, par value		$ 0.001		$ 0.001		$ 0.001
Shares of redeemable convertible preferred stock and redeemable common stock were converted into common stock \| shares				3,189,648
2012 Long-Term Incentive Plan [Member]
Stockholders' Equity (Additional Textual) [Abstract]
Plan with maximum term from the date of grant				10 years

Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Provision for income taxes	$ 3,185	$ 2,801	$ 7,957	$ 7,252
Effective income tax rate	32.20%	33.80%	32.40%	33.00%
U.S. federal statutory rate	35.00%		35.00%
Unrecognized tax benefits	$ 400		$ 400		$ 400

Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Revenue:
Revenue	$ 32,454	$ 26,915	$ 92,375	$ 73,302
Income from operations:
Income from operations	9,573	8,268	24,677	21,976
Depreciation and amortization:
Depreciation and amortization	1,612	1,127	4,380	3,009
Provision for income taxes:
Provision for income taxes	3,185	2,801	7,957	7,252
Capital expenditures:
Capital expenditures	1,771	3,733	14,435	10,083
Total assets:
Total assets	156,921		156,921		$ 62,326
United States [Member]
Revenue:
Revenue	25,582	20,287	72,652	57,510
Income from operations:
Income from operations	8,362	6,701	22,396	20,089
Depreciation and amortization:
Depreciation and amortization	1,261	807	3,360	2,126
Provision for income taxes:
Provision for income taxes	2,990	2,435	7,420	6,612
Capital expenditures:
Capital expenditures	1,371	3,301	11,196	8,302
Total assets:
Total assets	139,438		139,438		47,710
Europe [Member]
Revenue:
Revenue	5,771	5,790	16,305	13,941
Income from operations:
Income from operations	1,995	2,104	4,706	3,672
Depreciation and amortization:
Depreciation and amortization	250	273	722	747
Provision for income taxes:
Provision for income taxes	195	366	537	640
Capital expenditures:
Capital expenditures	377	450	1,706	1,425
Total assets:
Total assets	12,089		12,089		10,719
Other [Member]
Revenue:
Revenue	1,101	838	3,418	1,851
Income from operations:
Income from operations	(784)	(537)	(2,425)	(1,785)
Depreciation and amortization:
Depreciation and amortization	101	47	298	136
Provision for income taxes:
Provision for income taxes
Capital expenditures:
Capital expenditures	23	$ (18)	1,533	$ 356
Total assets:
Total assets	$ 5,394		$ 5,394		$ 3,897

Segment and Geographic Information (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue:
Total revenue	$ 32,454	$ 26,915	$ 92,375	$ 73,302
Protomold [Member]
Revenue:
Total revenue	23,458	19,951	66,697	55,087
First Cut [Member]
Revenue:
Total revenue	$ 8,996	$ 6,964	$ 25,678	$ 18,215

Segment and Geographic Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Revenue:
Total international	$ 7,647	$ 7,481	$ 22,488	$ 18,579
Total revenue	32,454	26,915	92,375	73,302
Long-lived assets:
International long-lived assets	7,790		7,790		$ 5,418
Total long-lived assets	44,457		44,457		34,249
United States [Member]
Revenue:
Revenue from United States	24,807	19,434	69,887	54,723
Long-lived assets:
Long-lived assets in United States	36,667		36,667		28,831
Europe [Member]
Revenue:
Total international	5,771	5,790	16,305	13,941
Long-lived assets:
International long-lived assets	4,532		4,532		3,377
Other [Member]
Revenue:
Total international	1,876	$ 1,691	6,183	$ 4,638
Long-lived assets:
International long-lived assets	$ 3,258		$ 3,258		$ 2,041

Segment and Geographic Information (Details Textual)	9 Months Ended
Segment and Geographic Information (Details Textual)	Sep. 30, 2012 Segment Product_Line
Segment Information (Textual) [Abstract]
Number of geographically-based operating segments \| Segment	3
Number of product lines \| Product_Line	2