Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the six months ended June 30, 2015 (number of units and aggregate intrinsic value in thousands):

	Number of Units		Weighted Average Grant-Date Fair Value		Aggregate Intrinsic Value
Units outstanding, beginning of year	1,226		$	13.23
Granted	368		27.44
Released	(364	)	11.14
Forfeited	(47	)	15.70
Units outstanding, end of period	1,183		18.18		$	39,411

Summary of the Company's Stock Options Activity

The following table summarizes stock option activity for the six months ended June 30, 2015 (number of units and aggregate intrinsic value in thousands):

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Options outstanding, beginning of year	1,641		$	5.26
Granted	—		—
Exercised	(500	)	4.96
Expired / terminated	(8	)	8.71
Options outstanding, end of period	1,133		5.35		3.87	$	31,685
Options exercisable, end of period	1,101		5.37		3.88	30,772
Options expected to vest, end of period	26		4.75		3.61	750

Reported Share-Based Compensation

The Company’s forfeiture rate was calculated based on its historical experience of awards which ultimately vested.

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Cost of products sold and services delivered	$	89	$	65	$	159	$	88
Sales, general and administrative expenses	925		948		1,858		1,658
Research and development expenses	665		494		1,206		938
Total stock-based compensation	$	1,679	$	1,507	$	3,223	$	2,684