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Stock-Based Compensation - Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2021 | Feb. 09, 2021 | Dec. 31, 2019 | Sep. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) |  |  |  |  | 10,248,025 |  | 6,577,312 |
Expected dividend yield |  |  |  |  | 0.00% | 0.00% |  |
Unrecognized compensation expense |  |  |  |  | $ 4,200 |  |  |
Unrecognized compensation expense, period for recognition, years |  |  |  |  | 2 years 10 months 24 days |  |  |
Employee stock option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options to purchase common stock, vested (in shares) | 829,547 |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 965,944 |  |  |
Exercised (in shares) |  |  |  |  | 0 |  |  |
Fair value of options vested |  |  |  |  | $ 2,100 | $ 400 |  |
Weighted average grant date fair value, options granted (in dollars per share) |  |  |  |  | $ 4.63 | $ 2.02 |  |
Restricted stock units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested (in shares) | 288,494 |  |  |  | 313,976 |  |  |
Fair value of options vested |  |  |  |  | $ 1,400 | $ 400 |  |
Number of outstanding and fully vested restricted stock units, unsettled (in shares) |  |  |  |  | 2,045,634 |  |  |
Phantom Stock Appreciation Rights (PSARs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 91,500 |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |
Phantom Stock Appreciation Rights (PSARs) | Long-term Debt |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
PSARs liability |  |  |  |  | $ 1,073 |  | $ 858 |
Stock Options and Restricted Stock Unit Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Impact of acceleration of vesting of awards |  |  |  |  | $ 3,100 |  |  |
2018 Equity incentive plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  |  |  |  |  |  |  | 6,287,687
2021 equity and incentive compensation plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  | 4,262,364 |  |  |  |  |  |
Expiration period |  | 10 years |  |  |  |  |  |
Increase in shares authorized as percent of outstanding shares of common stock |  | 4.00% |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 0 |  |  |

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