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Stock-Based Compensation - Restricted and Performance Stock Units Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2022 | Mar. 16, 2021 | Dec. 17, 2019 | Dec. 27, 2018 | Dec. 18, 2017 | Jul. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 25, 2022 | Jul. 17, 2020
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  |  |  |  |  |  | 8,000,000 |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  | 4 years |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  | $ 8.40 | $ 20.13 | $ 9.55 |  |
Total fair value of restricted stock vested |  |  |  |  |  |  | $ 2,288 | $ 2,179 | $ 2,699 |  |
Shares available (in shares) |  |  |  |  |  |  | 1,861,106 | 967,068 |  |  |
Restricted stock units | Directors And Certain Executive Officers |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  | 3 years |  |  |  |
Restricted stock units | Directors And Certain Executive Officers | Tranche One |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  | 1 year |  |  |  |
Performance stock units |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  | 3 years |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  | $ 8.23 | $ 20.70 | $ 9.58 |  |
Total fair value of restricted stock vested |  |  |  |  |  |  | $ 673 | $ 2,302 | $ 1,112 |  |
Shares available (in shares) |  |  |  |  |  |  | 1,112,031 | 763,697 |  |  |
Unrecognized compensation expense |  |  |  |  |  |  | $ 1,693 |  |  |  |
PSU - BLA Milestones |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  |  |  | 294,968 |  |  |  |
PSU - BLA Milestones | Tranche One |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
PSU - BLA Milestones | Tranche Two |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  | 1 year | 1 year | 1 year |  |  |  |  |  |
Vesting percentage |  |  | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
2020 PSUs |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  |  |  |  |  |  |  | 144,300
Achievement of award issued (as a percent) |  |  |  |  |  | 110.00% |  |  |  |  |
2021 PSUs |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  | 332,200 |  |  |  |  |  |  |  |  |
Value of grants reversed |  |  |  |  |  |  |  | $ 1,831 |  |  |
2021 PSUs | Minimum |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Performance stock unit, payout opportunity |  | 0.00% |  |  |  |  |  |  |  |  |
2021 PSUs | Maximum |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Performance stock unit, payout opportunity |  | 200.00% |  |  |  |  |  |  |  |  |
2022 PSUs |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  | 526,467 |  |  |  |  |  |  |  |  |
2022 PSUs | Minimum |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Performance stock unit, payout opportunity | 0.00% |  |  |  |  |  |  |  |  |  |
2022 PSUs | Maximum |  |  |  |  |  |  |  |  |  |  |
Stock Option Disclosures |  |  |  |  |  |  |  |  |  |  |
Performance stock unit, payout opportunity | 150.00% |  |  |  |  |  |  |  |  |  |

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