Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity under our 2013 Plan and related information during the three months ended March 31, 2017:

	Shares
	Subjectto			Weighted-
	Outstanding			Average Exercise
	Options			Price Per Share
Balance at December 31, 2016		5,817,116		$	25.26
Options granted		1,036,100			27.04
Options exercised		(196,871	)		15.86
Options canceled		(71,202	)		33.34
Balance at March 31, 2017		6,585,143		$	25.73

Summary of PSO Activity

The following table summarizes PSO activity under our 2013 Plan and related information during the three months ended March 31, 2017:

	Shares
	Subjectto		Weighted-
	Outstanding		Average Exercise
	Options		Price Per Share
Balance at December 31, 2016		180,752	$	23.76
Options granted		—		—
Options exercised		—		—
Options canceled		—		—
Balance at March 31, 2017		180,752	$	23.76

Summary of RSU Activity

The following table summarizes RSU activity, under our 2013 Plan and related information:

	Shares
	Subject to			Weighted-
	Outstanding			Average grant date
	RSUs			fair value per share
Balance at December 31, 2016		546,507		$	28.38
RSUs granted		306,050			25.54
RSUs released		(211,882	)		28.26
RSUs canceled		(8,932	)		27.37
Balance at March 31, 2017		631,743		$	27.06

Summary of PSU Activity

The following table summarizes PSU activity, under our 2013 Plan and related information:

	Shares
	Subject to			Weighted-
	Outstanding			Average grant date
	PSUs			fair value per share
Balance at December 31, 2016		285,866		$	29.24
PSUs granted		143,750			25.54
PSUs released		(8,917	)		50.30
PSUs canceled		(51,581	)		33.53
Balance at March 31, 2017		369,118		$	26.69

Classification of Stock-Based Compensation Expense

The table below sets forth the functional classification of stock-based compensation expense, net of estimated forfeitures, for the periods presented (in thousands):  

	Three Months Ended March 31,
	2017		2016
Research and development	$	4,150	$	3,030
Selling, general and administrative		4,884		4,039
Total stock-based compensation	$	9,034	$	7,069