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)

v3.19.2
Net Loss per Common Share - Antidilutive Securities Excluded From Computation of Diluted Net Loss per Common Share (Detail) - shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 8,838,236 7,525,982
Unvested RSUs    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 1,531,211 1,797,702
Vested and Unvested Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 7,291,729 5,718,914
ESPP Share Purchase Rights    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 15,296 9,366