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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Stock-Based Compensation.

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

The following table summarizes stock option activity under the 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan during the nine months ended September 30, 2019 (in thousands except option exercise price):

​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-	​	​	​	​
​	​	Number of	​	​		​	Average	​	​	​	​
​	​	Shares	​	​	Weighted-	​	Remaining	​	​	​	​
​	​	Underlying	​	Average		​	Contractual	​	​	Aggregate	​
​		Options		Exercise Price			Life (in years)	​		Intrinsic Value	​
Outstanding at December 31, 2018	​	6,307	​	$	23.69	​	6.7	​	$	204,896	​
Granted	​	186	​	​	68.10	​	​	​	​	​	​
Exercised	​	(583)	​	​	24.08	​	​	​	$	27,515	​
Canceled/forfeited/expired	​	(13)	​	​	38.57	​	​	​	​	​	​
Outstanding at September 30, 2019	​	5,897	​	$	25.04	​	6.2	​	$	222,005	​
Vested and expected to vest at September 30, 2019	​	5,834	​	$	24.85	​	6.1	​	$	220,714	​
Exercisable at September 30, 2019	​	4,352	​	$	19.79	​	5.5	​	$	185,936	​

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

​

​	​	​	​	​	​	​	​	​	​
​	​	Three Months Ended			​	Nine Months Ended			​
​	​	September 30,			​	September 30,			​
​		2019		2018		2019		2018	​
Risk-free interest rate	​	1.61	%	**	%	2.17	%	2.67	%
Expected dividend yield	​	0.00	%	**	%	0.00	%	0.0	%
Expected volatility	​	47.0	%	**	%	46.8	%	44.9	%
Expected term (in years)	​	6.01	​	**	​	6.01	​	6.10	​

Schedule summarizing restricted stock unit activity

​

​	​	​	​	​	​	​	​
​	​	​	​	​	​	Weighted-	​
​	​	​	Number of	​	​	average	​
​	​	​	shares	​	​	grant date	​
​		​	(in thousands)		​	fair value	​
Unvested at December 31, 2018	​	​	532	​	$	35.17	​
Granted	​	​	301	​	​	70.42	​
Vested	​	​	(210)	​	​	34.93	​
Canceled/forfeited	​	​	(17)	​	​	42.14	​
Unvested at September 30, 2019	​	​	606	​	$	52.39	​

Schedule summarizing the allocation of stock-based compensation

The following table summarizes the allocation of stock-based compensation related to stock options and RSUs in the accompanying condensed consolidated statements of operations (in thousands):

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Three Months Ended

​

Nine Months Ended

​

​

​

September 30,

​

September 30,

​

​

2019

2018

2019

2018

Cost of sales

​

$

259

​

$

175

​

$

752

​

$

526

​

Selling, general and administrative

​

​

6,727

​

​

5,538

​

​

18,555

​

​

14,418

​

Research and development

​

​

1,561

​

​

1,460

​

​

4,616

​

​

4,092

​

Total

​

$

8,547

​

$

7,173

​

$

23,923

​

$

19,036

​

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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