Stockholders' Equity and Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Underlying Options, Outstanding, Beginning Balance	4,101
Shares Underlying Options, Granted	232
Shares Underlying Options, Exercised	(632)
Shares Underlying Options, Forfeited or Cancelled	(440)
Shares Underlying Options, Outstanding, Ending Balance	3,261	4,101
Shares Underlying Options, Vested and Expected to Vest	3,147
Shares Underlying Options, Exercisable	1,747
Weighted-Average Exercise Price, Outstanding, Beginning Balance	$ 6.58
Weighted-Average Exercise Price, Granted	13.79
Weighted-Average Exercise Price, Exercised	3.73
Weighted-Average Exercise Price, Forfeited or Cancelled	11.24
Weighted-Average Exercise Price, Outstanding, Ending Balance	7.02	$ 6.58
Weighted-Average Exercise Price, Vested and Expected to Vest	6.85
Weighted-Average Exercise Price, Exercisable	$ 4.51
Weighted-Average Remaining Life, Outstanding	7 years 8 months 12 days	8 years 3 months 18 days
Weighted-Average Remaining Life, Vested and Expected to Vest	7 years 7 months 6 days
Weighted-Average Remaining Life, Exercisable	7 years
Aggregate Intrinsic Value, Outstanding	$ 59,868	$ 58,417
Aggregate Intrinsic Value, Vested and Expected to Vest	58,291
Aggregate Intrinsic Value, Exercisable	$ 36,451