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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 32,818 32,818 32,818 32,818
Convertible Debt        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 1,714 49,215 1,714 49,215
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 21,241 17,627 21,241 17,627
Restricted Stock Units (RSUs)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 10,346 11,001 10,346 11,001