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Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-based compensation expense |  |  |  |
Total stock based compensation expense | $ 1,055 | $ 1,036 | $ 2,207 | $ 1,304
Options vested, fair value |  |  | 3,000 | 1,200
Research and Development Expense |  |  |  |
Stock-based compensation expense |  |  |  |
Total stock based compensation expense | 126 | 72 | 460 | 112
Selling, general and administrative expense |  |  |  |
Stock-based compensation expense |  |  |  |
Total stock based compensation expense | 929 | $ 964 | 1,747 | $ 1,192
Options to purchase Common Stock |  |  |  |
Stock-based compensation expense |  |  |  |
Unrecognized compensation cost | $ 10,800 |  | $ 10,800 |
Weighted-average remaining vesting period for recognition |  |  | 3 years |
Options outstanding, weighted average contractual life |  |  | 7 years 10 months 24 days |

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