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Stock-based Compensation - Stock-based compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Stock-based Compensation |  |
Stock-based compensation expense | $ 265 | $ 89
Future compensation cost for awards not vested | $ 1,100 |
Weighted-average period compensation cost of unvested awards to be expensed | 2 years 3 months 18 days |
Sesen Bio, Inc. |  |
Stock-based Compensation |  |
Stock-based compensation expense | $ 200 |
Research and development |  |
Stock-based Compensation |  |
Stock-based compensation expense | 10 | 41
General and administrative |  |
Stock-based Compensation |  |
Stock-based compensation expense | $ 255 | $ 48

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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