Equity Incentive Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Shares Available for Grant, Beginning balance	5,011,459
Options Outstanding, Shares Available for Grant, Authorized	2,716,729
Options Outstanding, Shares Available for Grant, RSUs granted, net	(92,500)
Options Outstanding, Shares Available for Grant, Granted	(913,100)
Options Outstanding, Shares Available for Grant, Canceled	103,997
Options Outstanding, Shares Available for Grant, Ending balance	6,826,585
Options Outstanding, Number of Options, Beginning balance	10,690,156
Options Outstanding, Number of Options, Granted	913,100
Options Outstanding, Number of Options, Exercised	(642,845)
Options Outstanding, Number of Options, Canceled	(114,405)
Options Outstanding, Number of Options, Ending balance	10,846,006
Options Outstanding, Number of Options, Options exercisable	6,129,250
Options Outstanding, Number of Options, Options vested and expected to vest	10,622,133
Options Outstanding, Weighted-Average Exercise Price, Beginning balance	$ 6.65
Options Outstanding, Weighted-Average Exercise Price, Granted	10.74
Options Outstanding, Weighted-Average Exercise Price, Exercised	0.78
Options Outstanding, Weighted-Average Exercise Price, Canceled	17.46
Options Outstanding, Weighted-Average Exercise Price, Ending balance	7.23
Options Outstanding, Weighted-Average Exercise Price, Options exercisable	4.88
Options Outstanding, Weighted-Average Exercise Price, Options vested and expected to vest	$ 7.14
Options Outstanding, Aggregate Intrinsic Value, Balance	$ 68,779	$ 74,984
Options Outstanding, Aggregate Intrinsic Value, Options exercisable—June 30, 2017	50,920
Options Outstanding, Aggregate Intrinsic Value, Options vested and expected to vest—June 30, 2017	$ 68,244