Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2016

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the six months ended June 30, 2016 (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	1,139		$	19.30
Granted	435		16.48
Released	(281	)	15.92
Forfeited	(70	)	21.13
Units outstanding, end of period	1,223		18.97		$	30,432

Summary of the Company's Stock Options Activity

The following table summarizes stock option activity for the six months ended June 30, 2016 (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	1,103		$	5.37
Granted	—		—
Exercised	(45	)	4.91
Expired / terminated	—		—
Options outstanding, end of period	1,058		5.39		2.79	$	20,613
Options exercisable, end of period	1,027		5.41		2.80	19,996
Options expected to vest, end of period	25		4.75		2.48	503

Reported Share-Based Compensation

The following table summarizes the composition of stock stock-based compensation for the three and six months ended June 30, 2016 and 2015 (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Cost of products sold and services delivered	$	70	$	89	$	170	$	159
Sales, general and administrative expenses	1,459		925		2,849		1,858
Research and development expenses	777		665		1,507		1,206
Total stock-based compensation	$	2,306	$	1,679	$	4,526	$	3,223