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Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | $ 2,794 | $ 173 | $ 4,157 | $ 177
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | 427 | 14 | 771 | 15
General and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | $ 2,367 | $ 159 | $ 3,386 | $ 162

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