Description of Business, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities Excluded from Calculation of Diluted Net Loss per Share Would Be Anti-dilutive (Detail) - shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 10,680,000 | 7,273,000 |
| Warrants to purchase common stock | ||
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 4,235,000 | 5,032,000 |
| Common Stock Options | ||
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 6,445,000 | 2,226,000 |
| Common Stock Subject to Repurchase | ||
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||
| Potentially dilutive securities | 15,000 | |