Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the six months ended June 30, 2013:

				Weighted
				Average Grant-
	Number of			Date Fair		Aggregate
	Units			Value		Intrinsic Value
Units outstanding, beginning of period		582,212		$	5.42
Granted		641,179			8.86
Released		(149,137	)		5.29
Forfeited		(14,126	)		5.30
Units outstanding, end of period		1,060,128			7.52	$	9,032,291

Summary of the Company's Stock Options

The following table summarizes stock option activity for the six months ended June 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		(902,314	)		4.48
Expired / forfeited		(127,124	)		5.78
Options outstanding, end of period		5,291,638			6.32		4.30	$	13,573,609
Exercisable at June 30, 2013		4,747,679			6.52		4.03		11,450,150
Expected to vest after June 30, 2013		467,065			4.61		6.64		1,826,751

Reported Share-Based Compensation

Share-based compensation was classified as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Cost of products sold	$	49,436	$	28,748	$	83,868	$	95,892
Sales, general and administrative expenses		826,735		426,231		1,557,239		973,364
Research and development expenses		143,129		134,629		301,534		278,406
Total share-based compensation	$	1,019,300	$	589,608	$	1,942,641	$	1,347,662