Stock-Based Compensation - Schedule of Stock-Based Compensation Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding beginning balance (in shares) | shares	2,714
Granted (in shares) | shares	902
Exercised (in shares) | shares	(6)
Canceled/Forfeited (in shares) | shares	(325)
Outstanding ending balance (in shares) | shares	3,285
Exercisable at end of period (in shares) | shares	1,887
Vested at end of period (in shares) | shares	3,196
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding weighted average exercise price, beginning balance (in usd per share) | $ / shares	$ 17.18
Granted weighted average exercise price (in usd per share) | $ / shares	10.02
Exercised weighted average exercise price (in usd per share) | $ / shares	7.27
Canceled/Forfeited weighted average exercise price (in usd per share) | $ / shares	19.88
Outstanding weighted average exercise price, ending balance (in usd per share) | $ / shares	15.46
Exercisable weighted average exercise price at end of period (in usd per share) | $ / shares	17.76
Vested and unvested expected to vest weighted average exercise price at end of period (in usd per share) | $ / shares	$ 15.56
Outstanding, weighted average remaining term at end of period	7 years 6 months
Exercisable, weighted average remaining term at end of period	6 years 6 months
Vested and unvested expected to vest, weighted average remaining term at the end of period	7 years 6 months
Outstanding, intrinsic value at end of period | $	$ 2,458
Exercisable, intrinsic value at end of period | $	651
Vested and unvested expected to vest, intrinsic value at end of period | $	$ 2,340