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Stock-Based Compensation - Additional Information (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) shares | Mar. 31, 2021 USD ($) | Jan. 20, 2021 | Aug. 31, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock exchange ratio |  |  | 0.90686 |
Stock-based compensation expense | $ | $ 113,000 | $ 110,000 |  |
Unrecognized compensation cost related to equity award grants | $ | $ 1,100,000 |  |  |
Unrecognized compensation cost expected remaining vesting period | 2 years 9 months |  |  |
2018 Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock exchange ratio |  |  | 0.90686 |
Number of stock option grants | 0 |  |  |
Number of restricted stock grants | 0 |  |  |
2018 Equity Incentive Plan | Restricted Stock | Common Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares approved under the plan |  |  |  | 133,987
2018 Equity Incentive Plan | Stock Options | Common Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares approved under the plan |  |  |  | 334,970

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