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Stock Options and Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 28, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants during the period (in shares) |  | 184,487 |  |
Compensation cost related to restricted stock grants |  | $ 1,978 |  |
Compensation expense recognized for restricted shares |  | 652 | $ 565 |
Unrecognized compensation costs |  | $ 694 | $ 600 |
2010 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares not issued (in shares) | 215,513 |  |  |
2010 Plan | Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants during the period (in shares) |  | 76,597 |  |
2020 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares of common stock reserved for issuance (in shares) |  |  |  | 400,000

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