Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2014

The following table summarizes RSU activity for the three months ended March 31, 2014 (aggregate intrinsic value in thousands):


	Number of Units			Weighted Average Grant- Date Fair Value		Aggregate Intrinsic Value
Units outstanding, beginning of period		1,279,123		$	9.67
Granted		374,947			17.58
Released		(302,194	)		7.51
Forfeited		(107,070	)		13.57

Units outstanding, end of period		1,244,806			12.25	$	22,768

The following table summarizes stock option activity for the three months ended March 31, 2014 (aggregate intrinsic value in thousands):


	Number of options			Weighted Average Exercise Price		Average Remaining Contractual Life (years)		Aggregate Intrinsic Value
Options outstanding, beginning of period		3,365,692		$	6.15
Granted		—
Exercised		(1,027,600	)		7.08
Expired / forfeited		(27,134	)		9.77

Options outstanding, end of period		2,310,958			5.69		5.02	$	29,213

Exercisable at March 31, 2014		2,200,443			5.75		4.95		27,697

Expected to vest after March 31, 2014		68,150			4.49		7.02		940

Share-based compensation was classified as follows (in thousands):


	Three Months Ended March 31,
	2014		2013
Cost of products sold	$	22	$	34
Sales, general and administrative expenses		711		731
Research and development expenses		444		158

Total share-based compensation	$	1,177	$	923