Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the three months ended March 31, 2015 (number of units and aggregate intrinsic value in thousands):



	Number of Units		Weighted Average Grant-Date Fair Value		Aggregated Intrinsic Value
Units outstanding, beginning of year	1,226		$	13.23
Granted	295		26.75
Released	(249	)	10.83
Forfeited	(23	)	12.84
Units outstanding, end of period	1,249		16.91		$	30,104

Summary of the Company's Stock Options Activity

The following table summarizes stock option activity for the three months ended March 31, 2015 (number of units and aggregate intrinsic value in thousands):



	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregated Intrinsic Value
Options outstanding, beginning of year	1,641		$	5.26
Granted	—		—
Exercised	(107	)	5.65
Expired / terminated ^(a)	—		5.52
Options outstanding, end of period	1,534		5.23		4.25	$	28,962
Options exercisable, end of period	1,500		5.24		4.26	28,311
Options expected to vest, end of period	28		4.74		3.73	539

^(a) Actual units terminated during the period was 251, which displayed as zero due to rounding.

Reported Share-Based Compensation

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



	Three Months Ended March 31,
	2015		2014
Cost of products sold and services delivered	$	70	$	22
Sales, general and administrative expenses	934		711
Research and development expenses	540		444
Total stock-based compensation	$	1,544	$	1,177