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Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Stock-based Compensation |  |
Stock-based compensation expense | $ 1,057 | $ 265
Future compensation cost for awards not vested | $ 13,900 |
Weighted-average period compensation cost of unvested awards to be expensed | 3 years 2 months 12 days |
Sesen Bio, Inc. |  |
Stock-based Compensation |  |
Stock-based compensation expense |  | 200
Research and development |  |
Stock-based Compensation |  |
Stock-based compensation expense | $ 436 | 10
General and administrative |  |
Stock-based Compensation |  |
Stock-based compensation expense | $ 621 | $ 255

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