Common Stock - Restricted Stock Unit Awards - Additional Information (Detail) - Restricted Stock Unit [Member] - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Award vesting period | 4 years | ||
| Stock based compensation expense | $ 0.4 | $ 0.1 | $ 0.4 |
| Total unrecognized compensation expense related to the Company's restricted stock unit awards | $ 0.4 | ||
| Weighted-average period, restricted stock awards | 1 year 5 months 26 days | ||