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Summary of Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from Diluted Loss Per Share (Detail) - shares
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 16,908,173 19,287,215
Stock options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 5,041,073 4,996,215
Restricted Stock Units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 76,100  
Stock Warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 11,791,000 3,291,000
Convertible Senior Notes    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share   11,000,000