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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 32,818 32,818 32,818 32,818
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 23,631 21,241 23,631 21,241
Restricted Stock Units (RSUs)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 11,887 10,346 11,887 10,346
Exchangeable Senior Notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 7,716 1,714 7,716 1,714