Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock Options and Awards

Awards granted other than an option or stock appreciation right reduce the common stock shares available for grant under the program by 1.75 shares for each share issued.

	March 31,
	2014
Common stock shares available for grant		1,110,773
Common stock options outstanding		3,534,306
Restricted stock awards outstanding		44,000
Restricted stock units outstanding		598,830

Schedule of Employee Stock Purchase Plan

The intrinsic value listed below is calculated as the difference between the market value on the date of purchase and the purchase price of the shares.

	Three Months
	Ended
	March 31,
	2014
Shares purchased under ESPP		17,670
Average price of shares purchased under ESPP	$	9.95
Intrinsic value of shares purchased under ESPP	$	31,011

Schedule of Standard and Market-based Stock Options Activity

The following table sets forth the summary of standard option activity under the Company’s stock option plans for the three months ended March 31, 2014 and year ended December 31, 2013:

	Three Months			Year
	Ended			Ended
	March 31,			December 31,
	2014			2013
Beginning outstanding balance		3,227,167			3,155,631
Granted		287,575			1,058,700
Exercised		(29,826	)		(956,633	)
Forfeited and cancelled		(610	)		(30,531	)
Ending outstanding balance		3,484,306			3,227,167
Aggregate intrinsic value of options exercised	$	190,683		$	5,774,000
Weighted average fair value of options granted		5.56			5.63

The following table sets forth the summary of the market-based option activity under the Company’s stock option plans for the three months ended March 31, 2014:

	Three Months
	Ended
Market Condition Based Stock Options	March 31, 2014
Beginning outstanding balance		0
Granted		50,000
Exercised		0
Forfeited and cancelled		0
Ending outstanding balance		50,000
Aggregate intrinsic value of options exercised	$	0
Weighted average fair value of options granted		5.71

Schedule of Information Regarding Standard and Market Condition Based Stock Options Outstanding

Information regarding these standard stock options outstanding at March 31, 2014 and December 31, 2013 is summarized below:

					Weighted
			Weighted		Average		Aggregate
			Average		Remaining		Intrinsic
	Number of		Exercise		Contractual		Value
	Shares		Price		Life (years)		(In millions)
December 31, 2013
Options outstanding		3,227,167	$	7.78		5.46	$	9.9
Options vested and expected to vest using estimated forfeiture rates		2,994,044		7.61		5.41		9.6
Options exercisable		1,774,546		6.67		4.95		7.5
March 31, 2014
Options outstanding		3,484,306	$	8.13		5.15	$	10.2
Options vested and expected to vest using estimated forfeiture rates		3,258,924		7.96		5.10		10.0
Options exercisable		1,995,982		6.95		4.69		8.1

Information regarding these market condition based stock options outstanding at March 31, 2014 is summarized below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)		Aggregate Intrinsic Value (In millions)
Market Condition Based Stock Options
March 31, 2014
Options outstanding		50,000	$	11.94		6.90	$	0.0
Options vested and expected to vest using estimated forfeiture rates		41,795		11.94		6.90		0.0
Options exercisable		0		0.00		0.00		0.0

Schedule of Restricted Stock Units Activity

RSU activity for the three months ended March 31, 2014 and year ended December 31, 2013 was as follows:

	Three Months			Year
	Ended			Ended
	March 31,			December 31,
	2014			2013
Beginning outstanding balance		668,056			708,651
Awarded		209,380			294,150
Released		(276,525	)		(303,882	)
Forfeited		(2,081	)		(30,863	)
Ending outstanding balance		598,830			668,056
Weighted average grant date fair value of RSUs granted	$	11.89		$	7.12
Total fair value of RSUs released		3,061,012			2,806,000
Total fair value of RSUs remaining unvested		6,317,657			6,934,000

Schedule of Information Regarding Restricted Stock Unit Outstanding

Information regarding RSUs outstanding at March 31, 2014 and December 31, 2013 is summarized below:

			Weighted
			Average		Aggregate
			Remaining		Intrinsic		Fair
	Number of		Contractual		Value		Value
	Shares		Life (years)		(In millions)		(In millions)
December 31, 2013
RSUs outstanding		668,056		0.91	$	6.9	$	6.9
RSUs vested and expected to vest using estimated forfeiture rates		583,711		0.89		6.1
March 31, 2014
RSUs outstanding		598,830		1.44	$	6.3	$	6.3
RSUs vested and expected to vest using estimated forfeiture rates		482,334		1.38		5.1

Schedule of Restricted Stock Awards Activity

Restricted stock award activity for the three months ended March 31, 2014 and year ended December 31, 2013 was as follows:

	Three Months		Year
	Ended		Ended
	March 31,		December 31,
	2014		2013
Beginning outstanding balance		44,000		44,000
Awarded		0		44,000
Released		0		(44,000	)
Forfeited		0		0
Ending outstanding balance		44,000		44,000
Weighted average grant date fair value of restricted stock awarded	$	0	$	14.09
Total fair value of restricted stock awards released		0		676,000

Schedule of Stock Options, Market Condition Based Stock Options and Employee Stock Purchase Plan, Valuation Assumptions

The assumptions used to value option grants under the Company’s stock plans were as follows:

	Three Months Ended
	March 31,
	2014			2013
Standard Stock Options
Expected life (in years)		4.7			4.7
Volatility		57	%		69	%
Interest rate		1.4	%		0.8	%
Dividend yield		N/A			N/A

	Three Months Ended
	March 31,
	2014
Market Condition Based Stock Options
Expected life (in years)		7.0
Volatility		66	%
Interest rate		2.2	%
Dividend yield		N/A

	Three Months Ended
	March 31,
	2014			2013
Employee Stock Purchase Plan
Expected life (in years)		0.5			0.5
Volatility		39	%		66	%
Interest rate		0.1	%		0.1	%
Dividend yield		N/A			N/A

Schedule of Stock-Based Compensation

Total stock-based compensation recognized in the condensed consolidated statements of operations and comprehensive income (loss) is as follows:

	Three Months Ended
	March 31
	2014		2013
	(In thousands)
Statement of Operations Classifications
Sales and marketing	$	230	$	163
Research and development		475		314
General and administrative		878		560
Total	$	1,583	$	1,037