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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |
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Mar. 31, 2022 USD ($) $ / shares shares | Sep. 30, 2021 office $ / shares shares | Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted (in shares) | shares | 0 | 50,000 |
Exercise price of stock options granted (in dollars per share) | $ / shares | $ 0 | $ 1.08 |
Aggregate intrinsic value of options exercised | $ 42 |  |
Fair value of options vested | $ 12 |  |
Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of award |  | 1 year |
Number of equal monthly installments | office |  | 12 |
2018 Stock Option and Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of common stock shares (in shares) | shares | 897,229 |  |
Common stock reserved for issuance (in shares) | shares | 3,550,935 |  | 762,038
Unrecognized stock compensation expense | $ 5,309,000 |  |
Weighed-average period of costs amortized | 2 years 6 months |  |
2018 Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for issuance (in shares) | shares | 1,008,039 |  | 189,215
Unrecognized stock compensation expense | $ 283,000 |  |
Weighed-average period of costs amortized | 1 year 3 months 18 days |  |
2009 Stock Option and Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized stock compensation expense | $ 3,000 |  |
Weighed-average period of costs amortized | 1 year |  |

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