Stock-Based Compensation - Schedule of Stock-Based Compensation Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding beginning balance (in shares) | shares	2,112
Granted (in shares) | shares	1,080
Exercised (in shares) | shares	(96)
Canceled/Forfeited (in shares) | shares	(382)
Outstanding ending balance (in shares) | shares	2,714
Exercisable at end of period (in shares) | shares	1,504
Vested at end of period (in shares) | shares	2,707
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	$ 21.22
Granted weighted average exercise price (in usd per share) | $ / shares	12.36
Exercised weighted average exercise price (in usd per share) | $ / shares	14.94
Canceled/Forfeited weighted average exercise price (in usd per share) | $ / shares	22.19
Outstanding weighted average exercise price, ending balance (in usd per share) | $ / shares	17.78
Exercisable weighted average exercise price at end of period (in usd per share) | $ / shares	19.92
Vested and unvested expected to vest weighted average exercise price at end of period (in usd per share) | $ / shares	$ 17.77
Outstanding, weighted average remaining term at end of period	7 years 6 months
Exercisable, weighted average remaining term at end of period	6 years 3 months 18 days
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 | $	$ 2,549
Exercisable, intrinsic value at end of period | $	537
Vested and unvested expected to vest, intrinsic value at end of period | $	$ 2,548