Stockholders' Equity - Summary of Stock Option Activity under the Company's Equity-Based Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Beginning Balance	6,892,810
Number of Shares, Granted	312,200
Number of Shares, Exercised	(2,112,131)
Number of Shares, Forfeited	(645,480)
Number of Shares, Expired	(1,250)
Number of Shares, Ending Balance	4,446,149	6,892,810
Number of Shares, Exercisable, Ending Balance	2,100,591
Number of Shares, Vested and expected to vest, Ending Balance	4,257,065
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Beginning Balance	$ 6.13
Weighted-Average Exercise Price, Granted	31.66
Weighted-Average Exercise Price, Exercised	3.44
Weighted-Average Exercise Price, Forfeited	7.84
Weighted-Average Exercise Price, Expired	10.98
Weighted-Average Exercise Price, Ending Balance	8.96	$ 6.13
Weighted-Average Exercise Price, Exercisable, Ending Balance	6.20
Weighted-Average Exercise Price, Vested and expected to vest, Ending Balance	$ 8.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Term (in years)	7 years 6 months 22 days	8 years 2 months 19 days
Weighted-Average Remaining Contractual Term (in years), Exercisable	7 years 1 month 28 days
Weighted-Average Remaining Contractual Term (in years), Vested and expected to vest	7 years 6 months 11 days
Aggregate Intrinsic Value, Beginning Balance	$ 173,338
Aggregate Intrinsic Value, Ending Balance	52,108	$ 173,338
Aggregate Intrinsic Value, Exercisable, Ending Balance	28,922
Aggregate Intrinsic Value, Vested and expected to vest, Ending Balance	$ 50,675