Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Share (Details)

v3.7.0.1
Net Income (Loss) Per Share (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities (in shares) 18,571,555 12,997,374 7,800,841
Stock appreciation rights      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities (in shares) 2,422,716 2,072,130 1,400,824
Options to purchase common stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities (in shares) 43,513 87,026 87,026
Warrants to purchase common stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities (in shares) 0 0 17,916
2019 Convertible notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities (in shares) 7,895,675 10,838,218 6,295,075
2036 Convertible notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities (in shares) 8,209,651 0 0