Stock-Based Awards - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Options, Number of Shares
Number of Shares, beginning balance	2,702,350
Number of Shares, Granted	135,000
Number of Shares, Exercised	(36,738)
Number of Shares, Forfeited and canceled	(27,546)
Number of Shares, ending balance	2,773,066	2,702,350
Number of Shares, Options vested and expected to vest	2,773,066
Number of Shares, Options exercisable	736,308
Options, Weighted Average Exercise Price
Weighted Average Exercise Price, beginning balance (in dollars per share)	$ 18.94
Weighted Average Exercise Price, Granted (in dollars per share)	27.19
Weighted Average Exercise Price, Exercised (in dollars per share)	6.40
Weighted Average Exercise Price, Forfeited and cancelled (in dollars per share)	(17.55)
Weighted Average Exercise Price, ending balance (in dollars per share)	19.53	$ 18.94
Weighted Average Exercise Price, Options vested and expected to vest (in dollars per share)	19.53
Weighted Average Exercise Price, Options exercisable (in dollars per share)	$ 11.02
Options, Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term (in years)	8 years 7 months 21 days	9 years 18 days
Weighted Average Remaining Contractual Term, Options vested and expected to vest (in years)	8 years 7 months 21 days
Weighted Average Remaining Contractual Term, Options exercisable (in years)	7 years 11 months 27 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 23,461	$ 24,434
Aggregate Intrinsic Value, Options vested and expected to vest	23,461
Aggregate Intrinsic Value, Options exercisable	$ 12,043
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 20.81
2012 Equity Compensation Plan
Options, Number of Shares
Number of Shares, beginning balance	1,049,667
Number of Shares, Granted	1,140,524
Number of Shares, ending balance	1,003,647	1,049,667