Loss Per Share - Narrative (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially dilutive shares (in shares) 1,507,278 894,498 33,884,181
Convertible Notes [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially dilutive shares (in shares) 0