Accounting for Shared-based Payments - Schedule of Stock Option Activity (Details) - USD ($)	3 Months Ended		7 Months Ended	12 Months Ended				85 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jun. 22, 2010	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2016
Weighted Average Remaining Contractual Term
Stock based compensation expense	$ 12,575,000	$ 9,724,000				$ 4,722,000
Stock Options | $0.44-20.01
Number of Options
Balance outstanding, beginning of period (in shares)						11,324,049
Balance outstanding, end of period (in shares)							11,324,049
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)							$ 0.44
Exercise price, high end of the range (in dollars per share)							20.01
Weighted Average Exercise Price Per Share
Balance outstanding, beginning of period (in dollars per share)						$ 3.31
Balance outstanding, end of period (in dollars per share)							$ 3.31
Intrinsic Value
Intrinsic value of options outstanding							$ 37,521,000
Weighted Average Remaining Contractual Term
Balance outstanding						6 years 11 months 9 days
Stock Options | $2.83-4.24
Number of Options
Granted (in shares)						5,528,000
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)						$ 2.83
Exercise price, high end of the range (in dollars per share)						4.24
Weighted Average Exercise Price Per Share
Granted (in dollars per share)						$ 3.47
Intrinsic Value
Granted						$ 0
Stock Options | $3.40-3.95
Number of Options
Exercised (in shares)						(9,999)
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)						$ 3.40
Exercise price, high end of the range (in dollars per share)						3.95
Weighted Average Exercise Price Per Share
Exercised (in dollars per share)						$ 3.58
Intrinsic Value
Exercised						$ 25,000
Stock Options | $4.24-20.01
Number of Options
Forfeited (in shares)						(275,030)
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)						$ 4.24
Exercise price, high end of the range (in dollars per share)						20.01
Weighted Average Exercise Price Per Share
Forfeited (in dollars per share)						$ 13.42
Intrinsic Value
Forfeited						$ 0
Stock Options | $0.44-17.79
Number of Options
Balance outstanding, beginning of period (in shares)					16,567,020
Balance outstanding, end of period (in shares)						16,567,020
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)						$ 0.44
Exercise price, high end of the range (in dollars per share)						17.79
Weighted Average Exercise Price Per Share
Balance outstanding, beginning of period (in dollars per share)					$ 3.20
Balance outstanding, end of period (in dollars per share)						$ 3.20
Intrinsic Value
Intrinsic value of options outstanding						$ 8,949,000
Weighted Average Remaining Contractual Term
Balance outstanding					7 years 3 months 15 days
Stock Options | $2.94-9.33
Number of Options
Granted (in shares)					4,961,112
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)					$ 2.94
Exercise price, high end of the range (in dollars per share)					9.33
Weighted Average Exercise Price Per Share
Granted (in dollars per share)					$ 6.51
Intrinsic Value
Granted					$ 0
Stock Options | $2.98-6.28
Number of Options
Exercised (in shares)					(269,720)
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)					$ 2.98
Exercise price, high end of the range (in dollars per share)					6.28
Weighted Average Exercise Price Per Share
Exercised (in dollars per share)					$ 4.24
Intrinsic Value
Exercised					$ 904,000
Stock Options | $2.98-9.45
Number of Options
Forfeited (in shares)					(305,037)
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)					$ 2.98
Exercise price, high end of the range (in dollars per share)					9.45
Weighted Average Exercise Price Per Share
Forfeited (in dollars per share)					$ 6.22
Intrinsic Value
Forfeited					$ 0
Stock Options | $0.44-9.12
Number of Options
Balance outstanding, beginning of period (in shares)				20,953,375
Balance outstanding, end of period (in shares)	27,867,171	20,953,375		27,867,171	20,953,375			27,867,171
Exercisable at the end of the period (in shares)	12,732,928			12,732,928				12,732,928
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)				$ 0.44	$ 0.44
Exercise price, high end of the range (in dollars per share)				9.12	9.12
Weighted Average Exercise Price Per Share
Balance outstanding, beginning of period (in dollars per share)				3.86
Balance outstanding, end of period (in dollars per share)	$ 3.78	$ 3.86		3.78	$ 3.86			$ 3.78
Exercisable at the end of the period (in dollars per share)	$ 3.88			$ 3.88				$ 3.88
Intrinsic Value
Intrinsic value of options outstanding	$ 65,618,000	$ 42,438,000		$ 65,618,000	$ 42,438,000			$ 65,618,000
Intrinsic value of options exercisable, end of period	$ 33,626,000			$ 33,626,000				33,626,000
Weighted Average Remaining Contractual Term
Balance outstanding				7 years 18 days	7 years 1 month 24 days
Exercisable at the end of the period				6 years 1 month 28 days
Stock Options | $0.44-9.12 | Contingent vesting
Intrinsic Value
Granted			$ 28,600,000
Weighted Average Remaining Contractual Term
Stock based compensation expense								$ 0
Stock Options | $2.93-5.63
Number of Options
Granted (in shares)				7,537,000
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)				$ 2.93
Exercise price, high end of the range (in dollars per share)				5.63
Weighted Average Exercise Price Per Share
Granted (in dollars per share)				$ 3.99
Intrinsic Value
Granted				$ 0
Stock Options | $2.94-4.61
Number of Options
Exercised (in shares)				(70,185)
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)				$ 2.94
Exercise price, high end of the range (in dollars per share)				4.61
Weighted Average Exercise Price Per Share
Exercised (in dollars per share)				$ 3.17
Intrinsic Value
Exercised				$ 143,000
Stock Options | $2.98-9.12
Number of Options
Forfeited (in shares)				(553,019)
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)				$ 2.98
Exercise price, high end of the range (in dollars per share)				9.12
Weighted Average Exercise Price Per Share
Forfeited (in dollars per share)				$ 5.98
Intrinsic Value
Forfeited				$ 0