Stock-Based Compensation - Schedule of Weighted-Average Assumptions Used in Black-Scholes Option-Pricing Model to Estimate Fair Value of Employee Stock Options at Grant Date (Detail) - Employee or Director [Member] |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
| Expected term | 6 years 3 days | 6 years 3 days | 6 years 3 days |
| Risk-free interest rate | 1.10% | 1.10% | 2.30% |
| Expected volatility | 79.00% | 73.00% | 83.00% |