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Net Loss Per Share - Schedule of Anti-dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from computation of net loss per share 14,875 14,455 15,160
Employee stock options [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from computation of net loss per share 13,660 13,583 14,427
RSUs outstanding [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from computation of net loss per share 1,211 865 560
Warrants [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from computation of net loss per share 4 7 173