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Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Stock-based Compensation |  |  |  |
Stock-based compensation expense | $ 848 | $ 88 | $ 1,443 | $ 235
Future compensation cost for awards not vested | 11,700 |  | $ 11,700 |
Weighted-average period compensation cost of unvested awards to be expensed |  |  | 3 years 9 months 18 days |
Sesen Bio, Inc. |  |  |  |
Stock-based Compensation |  |  |  |
Stock-based compensation expense |  |  | $ 200 |
Research and development |  |  |  |
Stock-based Compensation |  |  |  |
Stock-based compensation expense | 418 | 45 | 452 | 122
General and administrative |  |  |  |
Stock-based Compensation |  |  |  |
Stock-based compensation expense | $ 430 | $ 43 | $ 991 | $ 113

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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