Stock Plans (Tables)

12 Months Ended

Dec. 31, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes total aggregate stock option activity for the period December 31, 2013 through December 31, 2014:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Balance at December 31, 2013	862,306		$	11.24
Granted	—		—
Exercised	(102,795	)	9.43
Canceled	(87,500	)	7.55
Balance at December 31, 2014	672,011		$	12.00	3.23	$	315,561
Vested or expected to vest at December 31, 2014	672,011		$	12.00	3.23	$	315,561
Exercisable at December 31, 2014	672,011		$	12.00	3.23	$	315,561

Nonvested Restricted Stock Shares Activity

The following table summarizes restricted stock award activity for the period December 31, 2013 through December 31, 2014 (in thousands, except for per share dollar amounts):

Nonvested Shares	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2013	524		$	12.88
Granted	256		14.21
Vested	(136	)	15.82
Forfeited	(116	)	8.31
Nonvested at December 31, 2014	528		$	13.77

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The share price used for the model is a 15% discount on the stock price on the first day of the offering period; the number of shares to be purchased is calculated based on employee contributions, and by using the following weighted-average assumptions:

	Year Ended December 31,
	2014			2013			2012
Expected dividends	$	—		$	—		$	—
Stock price on valuation date	8.47			7.77			11.96
Expected volatility	77		%	46		%	71		%
Risk-free interest rate	0.08		%	0.07		%	0.10		%
Expected life (in years)	0.4			0.3			0.5
Fair value per share	$	4.56		$	2.45		$	4.16

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

Compensation cost for stock options, restricted stock, restricted stock units and the ESPP is as follows (in thousands):

	Year Ended December 31,
	2014		2013		2012
Stock options	$	52	$	827	$	978
Restricted stock	2,536		2,491		1,427
Restricted stock units	867		592		421
ESPP	512		70		262
Total stock-based compensation expense	$	3,967	$	3,980	$	3,088

Stock-based compensation cost included in cost of revenue; selling, general and administrative expense; and research and development expense is as follows (in thousands):

	Year Ended December 31,
	2014		2013		2012
Cost of revenue	$	740	$	1,079	$	701
Selling, general and administrative	2,362		2,140		1,835
Research and development	865		761		552
Total stock-based compensation expense	$	3,967	$	3,980	$	3,088

Schedule of Stock Plan Shares Reserved for Future Issuance

The following table summarizes the reservation of shares under the Company's stock-based compensation plans as of December 31, 2014:

2013 Omnibus Equity Incentive Plan	1,574,258
2004 Employee Stock Purchase Plan	474,748
2005 Omnibus Equity Incentive Plan	672,011
Total	2,721,017

Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

Since the vesting of the market-condition restricted stock units is dependent on stock price performance, the fair values of these awards were estimated using a Monte-Carlo valuation model with the following weighted-average assumptions:

Market price at grant per share	$	15.03
Expected dividends	$	—
Expected volatility	65		%
Risk-free interest rate	0.86		%
Fair value per unit	$	7.71

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes the amount of compensation expense recognized for employee restricted stock unit awards for the years ended December 31, 2014. No restricted stock unit awards were granted to employees in 2013 and 2012 (in thousands):

	Year Ended December 31,
	2014
Service-based restricted stock units	$	137
Performance-based restricted stock units	28
Market-condition restricted stock units	90
Total compensation expense recognized for employee restricted stock units	$	255