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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity Incentive plan shares for issuance authorized | 5,000,000 |  |  | 5,000,000 |  |
Weighted Average Exercise Price, Exercised |  |  |  | $ 1.31 |  |
Number of stock options exercised | 0 |  | 0 | 217,718 | 0 |
Accrued expenses and other current liabilities | $ 3,888 |  |  | $ 3,888 |  | $ 2,275
STIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Accrued expenses and other current liabilities | 400 |  |  | 400 |  | $ 0
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total intrinsic value | 100 |  | $ 200 | 100 | $ 400 |
Fair value | $ 100 |  | $ 300 | $ 100 | $ 500 |
Vested (in shares) | 49,755 |  | 58,133 | 52,797 | 93,205 |
Deferred Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of units Granted |  | 130,000 |  |  |  |
Number of units Granted in lieu of board fees | 1,960 |  |  | 1,960 |  |
Additional disclosures |  |  |  |  |  |
Vesting period |  | 10 years |  |  |  |
Deferred stock units liability | $ 200 |  |  | $ 200 |  |
Deferred stock units expense |  |  |  | $ 200 |  |

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