Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the nine months ended September 30, 2013:

				Weighted
				Average Grant-
	Number of			Date Fair		Aggregate
	Units			Value		Intrinsic Value
Units outstanding, beginning of period		582,212		$	5.42
Granted		736,479			8.98
Released		(158,700	)		5.39
Forfeited		(44,814	)		7.24
Units outstanding, end of period		1,115,177			7.71	$	16,593,834

Summary of the Company's Stock Options

The following table summarizes stock option activity for the nine months ended September 30, 2013:

						Average
				Weighted		Remaining
	Number of			Average		Contractual		Aggregate
	options			Exercise Price		Life (years)		Intrinsic Value
Options outstanding, beginning of period		6,321,076		$	6.05
Granted		—
Exercised		(1,985,596	)		5.14
Expired / forfeited		(132,288	)		5.72
Options outstanding,end of period		4,203,192			6.49		4.51	$	35,702,302
Exercisable at September 30, 2013		3,754,714			6.71		4.31		31,097,408
Expected to vest after September 30, 2013		380,339			4.60		6.19		3,908,919

Reported Share-Based Compensation

Share-based compensation was classified as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of products sold	$	49,632	$	38,085	$	133,500	$	133,977
Sales, general and administrative expenses		735,433		657,870		2,292,672		1,631,234
Research and development expenses		177,929		153,433		479,463		431,839
Total share-based compensation	$	962,994	$	849,388	$	2,905,635	$	2,197,050