Net Loss per Common Share - Antidilutive Securities Excluded From Computation of Diluted Net Loss per Common Share (Detail) - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share | 11,905,581 | 8,740,355 |
| Unvested RSUs | ||
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share | 3,630,713 | 1,860,374 |
| Vested and Unvested Options | ||
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share | 8,096,471 | 6,842,443 |
| ESPP Share Purchase Rights | ||
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share | 178,397 | 37,538 |