Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 16, 2014	Nov. 30, 2014
Share-based compensation
Number of shares authorized (in shares)						40,000,000
Shares available for issuance	4,100,000			4,100,000
Unvested share activity
Awarded (in shares)			700,000		16,900,000
Number of Shares
Stock-based compensation costs expensed	$ 0.3			$ 1.1
Vest over three years
Number of Shares
Award vesting period (in years)				3 years
Vest over four years
Number of Shares
Award vesting period (in years)				4 years
Restricted Stock
Unvested share activity
Unvested at beginning of period (in shares)			13,923,230	13,923,230
Awarded (in shares)	0	0		719,132
Vested (in shares)				(627,659)
Forfeited (in shares)				(1,611,834)
Unvested at end of period (in shares)	12,402,869			12,402,869	13,923,230
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)			$ 0.34	$ 0.34
Awarded (in dollars per share)				0.24
Vested (in dollars per share)				0.34
Forfeited (in dollars per share)				0.34
Unvested at end of period (in dollars per share)	$ 0.33			$ 0.33	$ 0.34
Number of Shares
Unvested at beginning of period (in shares)			3,205,597	3,205,597
Awarded (in shares)				(719,132)
Forfeited (in shares)				1,611,834
Unvested at end of period (in shares)	4,098,299			4,098,299	3,205,597
Vested (in shares)				627,659
Restricted Stock | Vesting over four anniversaries
Unvested share activity
Vested (in shares)				(10,685,109)
Number of Shares
Vested (in shares)				10,685,109
Vesting rate per anniversary date of grant (as a percent)				67.00%
Restricted Stock | Fourth anniversary of grant
Number of Shares
Vesting rate per anniversary date of grant (as a percent)				33.00%
Restricted Stock | Vest over three years
Unvested share activity
Vested (in shares)				(1,117,760)
Number of Shares
Vested (in shares)				1,117,760
Restricted Stock | Vest over four years
Unvested share activity
Vested (in shares)				(600,000)
Number of Shares
Vested (in shares)				600,000
2014 LTIP
Share-based compensation
Number of shares authorized (in shares)							20,000,000