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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Stock-Based Compensation.

Schedule summarizing stock option activity under the 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan

Stock Options

The following table summarizes stock option activity under the 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan (in thousands):

		Number of					Weighted-
		shares		Weighted-			average		Aggregate
		underlying		average			remaining		intrinsic
		options		exercise price			contractual		value (in
		(in thousands)		per share			life (in years)		thousands)
Outstanding at December 31, 2015		5,701		$	7.10		6.7		$	102,390
Granted		1,979			21.24
Exercised		(1,660)			3.65					42,458
Canceled/forfeited/expired		(109)			20.00
Outstanding at December 31, 2016		5,911		$	12.59		7.3			129,591
Granted		1,877			43.85
Exercised		(639)			5.76					22,105
Canceled/forfeited/expired		(123)			23.79
Outstanding at December 31, 2017		7,026		$	21.36		7.3		$	69,555
Granted		896			30.83
Exercised		(1,304)			14.27					46,639
Canceled/forfeited/expired		(311)			31.14
Outstanding at December 31, 2018		6,307		$	23.69		6.7		$	204,896
Vested and expected to vest at December 31, 2018		6,213		$	23.53		6.7		$	202,779
Exercisable at December 31, 2018		3,929		$	17.54		5.8		$	151,798

Schedule summarizing restricted stock unit activity

Restricted Stock Units

The following table summarizes the activity of unvested restricted stock units under the Stock Plans during the years ended December 31, 2018 and December 31, 2017:

					Weighted-
			Number of		average
			shares		grant date
			(in thousands)		fair value
Unvested at December 31, 2016			—		$	—
Granted			173			39.10
Vested			—			—
Canceled/forfeited			—			—
Unvested at December 31, 2017			173		$	39.10
Granted			419			33.64
Vested			(41)			39.36
Canceled/forfeited			(19)			33.67
Unvested at December 31, 2018			532		$	35.17

Schedule summarizing the allocation of stock-based compensation

		Year ended
		December 31,
		2018			2017			2016
Cost of sales		$	703		$	597		$	233
Selling, general & administrative			19,816			13,006			6,475
Research and development			5,185			3,989			2,078
Total		$	25,704		$	17,592		$	8,786

Schedule of the weighted-average assumptions used to estimate the fair value of options granted to employees

			Year ended
			December 31,
			2018			2017			2016
Risk-free interest rate			2.67	%		2.13	%		1.59	%
Expected dividend yield			0.0	%		0.0	%		0.0	%
Expected volatility			44.9	%		46.5	%		52.9	%
Expected term (in years)			6.10			6.04			6.04

Schedule of Common stock reserved for issuance

Common stock reserved for issuance is as follows (in thousands):

		As of
		December 31,
		2018
Stock options issued and outstanding—2001 Plan		510
Stock options issued and outstanding—2011 Plan		1,540
Stock options issued and outstanding—2015 Plan		4,789
Employee stock purchase plan		1,062
Authorized for future stock awards or option grants		4,226
		12,127

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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