Quarterly report pursuant to Section 13 or 15(d)

Net Loss per Common Share - Antidilutive Securities Excluded From Computation of Diluted Net Loss per Common Share (Detail)

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Net Loss per Common Share - Antidilutive Securities Excluded From Computation of Diluted Net Loss per Common Share (Detail) - shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 11,316,174 9,441,699
Unvested RSUs    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 3,003,142 2,001,218
Vested and Unvested Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 8,205,062 7,364,588
ESPP Share Purchase Rights    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 107,970 75,893