Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the three months ended March 31, 2017 (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	1,330		$	20.40
Granted	786		25.57
Released	(241	)	18.87
Forfeited	(16	)	23.87
Units outstanding, end of period	1,859		22.74		$	42,367

Summary of the Stock Option Activity

The following table summarizes stock option activity for the three months ended March 31, 2017 (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	1,008		$	5.40
Granted	—		—
Exercised	(45	)	6.60
Expired / terminated	—		—
Options outstanding, end of period	963		5.35		2.03	$	—
Options exercisable, end of period	932		5.38		2.03	—
Options expected to vest, end of period	25		4.75		1.73	451

Stock-Based Compensation

The following table summarizes the composition of stock stock-based compensation for the three months ended March 31, 2017 and 2016 (in thousands):

	Three Months Ended March 31,
	2017		2016
Cost of products sold and services delivered	$	79	$	100
Sales, general and administrative expenses	2,028		1,390
Research and development expenses	1,340		730
Total stock-based compensation	$	3,447	$	2,220