Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The fair value of stock options granted were estimated at the date of grant using the following weighted-average assumptions:


	Three Months Ended March 31,
	2013			2012
Expected life in years		6.3			6.2
Risk-free interest rate		1.36	%		1.37	%
Volatility		54	%		57	%
Dividend yield		—			—
Weighted-average fair value of stock options granted	$	3.38		$	5.98

Summary of Status of Company's Stock Option Activity

The following is a summary of the status of the Company’s stock options as of March 31, 2013 and the stock option activity for all stock option plans during the three months ended March 31, 2013.


	Number of Shares			Exercise Price Per Share	Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2012		3,437,879		$0.31 – 16.88	$	5.48
Granted		56,570		6.48		6.48
Exercised		(93,886	)	0.31 – 9.31		1.15			$	509
Canceled		(77,497	)	1.72 – 16.88		11.69


Outstanding at March 31, 2013		3,323,066		$0.31 – 16.88	$	5.47		6.59	$	8,790


Exercisable at March 31, 2013		2,481,977		$0.31 – 16.88	$	3.58		6.02	$	8,689


Vested or expected to vest at March 31, 2013 (2)		3,175,743		$0.31 – 16.88	$	5.19		6.50	$	8,785

(1)	The aggregate intrinsic value was calculated based on the positive difference between the fair value of the Company’s common stock on March 31, 2013 of $6.21 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options.

(2)	This represents the number of vested options as of March 31, 2013 plus the number of unvested options expected to vest as of March 31, 2013 based on the unvested options outstanding at March 31, 2013, adjusted for an estimated forfeiture rate.

Restricted Stock Units Award Activity

The following table summarizes the restricted stock unit award activity during the three months ended March 31, 2013:


	Shares			Weighted Average Grant Date Fair Value
Unvested by December 31, 2012		1,265,421		$	11.72
Granted		337,306			6.48
Vested and issued		(33,823	)		7.65
Canceled		(66,448	)		11.00


Unvested by March 31, 2013		1,502,456		$	10.57

The following table summarizes the restricted stock award activity during the three months ended March 31, 2013:


	Shares			Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Unvested by December 31, 2012		4,887		$	9.31
Granted		—			—
Vested		(4,887	)	$	9.31
Repurchased		—			—


Unvested by March 31, 2013		—		$	—	$	—