Stock-Based Compensation - Schedule of Restricted Stock (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Restricted stock award (RSAs)
Number of Shares Outstanding [Roll Forward]
Beginning balance (in shares)	4,688,975
Converted (in shares)	(35,212)
Forfeited (in shares)	(427,561)
Ending balance (in shares)	4,226,202
Weighted Average Grant Date Fair Value Per Share
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.18
Forfeited (in dollars per share) | $ / shares	0.21
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.17
Outstanding, aggregate intrinsic value | $	$ 21.3
Restricted stock units (RSUs)
Number of Shares Outstanding [Roll Forward]
Beginning balance (in shares)	2,311,687
Granted (in shares)	648,207
Converted (in shares)	(144,706)
Forfeited (in shares)	(478,673)
Ending balance (in shares)	2,336,515
Weighted Average Grant Date Fair Value Per Share
Outstanding, aggregate intrinsic value | $	$ 11.8
Outstanding, weighted average remaining contractual life	1 year 2 months