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Stock-Based Compensation - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 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 |
Weighted average per share fair value of option | $ / shares | $ 5.34 |  | $ 5.34 |  |  |
Number of stock option grants | 13,454 |  |  |  |  |
Weighted Average Exercise Price, Granted | $ / shares | $ 13.09 |  |  |  |  |
Stock-based compensation expense | $ | $ 110,000 | $ 110,000 | $ 295,000 | $ 188,000 |  |
Reversal of stock compensation expense | $ |  |  |  | $ 152,000 |  |
Unrecognized compensation cost related to equity award grants | $ | $ 1,400,000 |  | $ 1,400,000 |  |  |
Unrecognized compensation cost expected remaining vesting period |  |  | 3 years 3 months |  |  |
2018 Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common stock exchange ratio |  |  |  |  | 0.90686 |
Dividend yield |  |  | 0.00% |  |  |
Expected volatility |  |  | 36.62% |  |  |
Risk-free interest rate |  |  | 1.04% |  |  |
Expected average life |  |  | 7 years 6 months |  |  |
Number of stock option grants |  |  | 13,454 |  |  |
Weighted Average Exercise Price, Granted | $ / shares |  |  | $ 13.09 |  |  |
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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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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