Equity Incentive Plans - Summary of Stock Option Activity Under 2007 Plan, 2011 Plan and 2016 Plan (Details) - Stock Option - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Options Outstanding
Outstanding at beginning of period	10,506,000
Options granted	2,217,000
Options exercised	(261,000)
Options forfeited or canceled	(1,259,000)
Outstanding at end of period	11,203,000	10,506,000
Vested and expected to vest at end of period	11,090,000
Exercisable at end of period	6,447,000
Weighted Average Exercise Price per Share
Outstanding at beginning of period	$ 8.51
Options granted	14.55
Options exercised	5.09
Options forfeited or canceled	11.18
Outstanding at end of period	9.49	$ 8.51
Vested and expected to vest at end of period	9.43
Exercisable at end of period	$ 6.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding	6 years 10 months 13 days
Vested and expected to vest at end of period	6 years 10 months 2 days
Exercisable at end of period	5 years 6 months 7 days
Total Intrinsic Value	$ 101,306	$ 60,911
Vested and expected to vest at end of period	100,907
Exercisable at end of period	$ 78,675