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Anti-Dilutive Securities Not Included in the Computation of Net Loss per Share (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Preferred Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities 32,818 35,215
Convertible Debt    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities 59,407 49,215
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities 20,807 12,078
Restricted Stock Units (RSUs)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities 10,673 4,071