Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity Under Stock Incentive Plans

A summary of activity under the stock incentive plans is as follows (in thousands, except share data and price per share):

	Shares Subject to Outstanding Options			Weighted- Average Exercise Price Per Share		Aggregate Intrinsic Value
Outstanding — Balance at December 31, 2014		3,759,839		$	3.00	$	12,499
Options granted		352,493			7.30
Options exercised		(355,965	)		0.53
Options cancelled and forfeited		(11,833	)		7.92
Outstanding — Balance at September 30, 2015		3,744,534		$	3.61	$	4,332
Options vested and exercisable — September 30, 2015		3,359,944		$	3.20	$	4,322