Stock-Based Compensation - Summary of Options Outstanding that have Vested or are Expected to Vest (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares, vested (shares) | shares	2,442
Number of shares, expected to vest, net of forfeitures (shares) | shares	932
Number of shares, total vested and expected to vest, net of forfeitures (shares) | shares	3,374
Weighted-average exercise price per share, vested (usd per share)	$ 18.01
Weighted-average exercise price per share, Expected to vest, net of forfeitures (usd per share)	13.24
Weighted-average exercise price per share, Total vested and expected to vest, net of forfeitures (usd per share)	$ 16.69
Weighted-average remaining contractual life, vested	5 years 9 months 18 days
Weighted-average remaining contractual life, Expected to vest, net of forfeitures	9 years 1 month 6 days
Weighted-average remaining contractual life, Total vested and expected to vest, net of forfeitures	6 years 8 months 12 days
Aggregate intrinsic value, vested | $	$ 589	[1]
Aggregate intrinsic value, Expected to vest, net of forfeitures | $	354	[1]
Aggregate intrinsic value, Total vested and expected to vest, net of forfeitures | $	$ 943	[1]
Stock price on the last trading day of 2014 (usd per share)	$ 7.28

[1] Aggregate intrinsic value was calculated as the difference between the closing stock price on the last trading day of 2016, which was $7.28, and the exercise price of the options, multiplied by the number of in-the-money options.