Net Loss Per Share of Common Stock - Schedule of Antidilutive Securities Excluded from Computation of Diluted Weighted Average Shares Outstanding (Detail) - shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Potentially antidilutive securities outstanding excluded from the computation of diluted weighted average shares | 14,204,134 | 4,250,248 | 3,843,091 |
| Employee Stock Options [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Potentially antidilutive securities outstanding excluded from the computation of diluted weighted average shares | 1,853,841 | 1,216,338 | 718,788 |
| Warrants [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Potentially antidilutive securities outstanding excluded from the computation of diluted weighted average shares | 12,350,293 | 3,033,910 | 3,124,303 |