Net Loss Per Share - Schedule of Anti-dilutive Equity Instruments Excluded from Calculation of Diluted Net Loss Per Share (Detail) - shares |
9 Months Ended | |
---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
|
Earnings Per Share Basic [Line Items] | ||
Anti-dilutive securities excluded from calculation of diluted net loss per share | 5,584,852 | 37,022,016 |
Awards under Equity Incentive Plan [Member] | ||
Earnings Per Share Basic [Line Items] | ||
Anti-dilutive securities excluded from calculation of diluted net loss per share | 4,978,725 | 4,688,659 |
Nonvested Restricted Shares and Restricted Stock Units [Member] | ||
Earnings Per Share Basic [Line Items] | ||
Anti-dilutive securities excluded from calculation of diluted net loss per share | 528,334 | 504,647 |
Warrants to Purchase Common Stock [Member] | ||
Earnings Per Share Basic [Line Items] | ||
Anti-dilutive securities excluded from calculation of diluted net loss per share | 77,793 | 31,828,710 |