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Stock-based Compensation - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) segment $ / shares shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2021 USD ($) segment $ / shares shares | Sep. 30, 2020 USD ($) $ / shares | Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ | $ 1,347,000 | $ 126,000 | $ 4,275,000 | $ 497,000 |
Unrecognized compensation expense | $ | $ 13,900,000 |  | $ 13,900,000 |  |
Number of equity compensation plans | segment | 2 |  | 2 |  |
Options outstanding, beginning balance (in shares) | 10,518,263 |  | 10,518,263 |  | 4,224,433
Options, grants in period, weighted average grant date fair value (in USD per share) | $ / shares | $ 5.97 | $ 0.34 | $ 2.77 | $ 0.34 |
Options, vested in period, fair value | $ | $ 100,000 | $ 100,000 | $ 700,000 | $ 300,000 |
2014 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized for grant (in shares) | 800,000 |  | 800,000 |  |
2019 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized for grant (in shares) | 11,500,000 |  | 11,500,000 |  |
Options to purchase common stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to options outstanding, weighted average period for expense to be recognized |  |  | 2 years 2 months 12 days |  |
Share-based Payment Arrangement, Performance Based Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ | $ 41,300 | $ 0 | $ 1,100,000 | $ 0 |
Options not yet exercisable (in shares) | 1,500,000 |  | 1,500,000 |  |
Options outstanding, beginning balance (in shares) |  |  |  |  | 0

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