Net Income (Loss) Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	13,356,367,000	12,062,987,000	13,046,503	6,270,138
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	709,000	0	709	0
Stock appreciation rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	2,430,414,000	1,137,743,000	2,120,550	1,401,144
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	87,026,000	87,026,000	87,026	87,026
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	0	0	0	17,916
Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	10,838,218,000	10,838,218,000	10,838,218	4,764,052