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Stock-based Compensation -Schedule of Stock Option Activity (Details) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 $ / shares
Options |  |
Outstanding as of December 31, 2022 (in shares) | shares | 3,356,937 |
Sesen Bio options assumed in the Merger (in shares) | shares | 765,223 |
Exercised (in shares) | shares | (49,770) |
Granted (in shares) | shares | 2,805,152 |
Forfeited (in shares) | shares | (87,275) |
Expired (in shares) | shares | (274,922) |
Outstanding as of September 30, 2023 (in shares) | shares | 6,515,345 |
Exercisable as of September 30, 2023 (in shares) | shares | 3,038,911 |
Vested and expected to vest at September 30, 2023 (in shares) | shares | 6,515,345 |
Weighted average exercise price |  |
Outstanding as of December 31, 2022 (in USD per share) | $ 1.01 |
Sesen Bio options assumed in the Merger (in USD per share) | 27.94 |
Exercised (in USD per share) | 1.72 |
Granted (in USD per share) | 7.14 |
Forfeited (in USD per share) | 4.70 |
Expired (in USD per share) | 23.52 |
Outstanding as of September 30, 2023 (in USD per share) | 6.28 |
Exercisable as of September 30, 2023 (in USD per share) | 6.71 |
Vested and expected to vest at September 30, 2023 (in USD per share) | 6.28 |
Share based compensation arrangement by share based payment award options grants in period weighted average grant date fair value (in USD per share) | $ 4.42 | $ 1.46
Weighted average remaining contractual term (years) |  |
Outstanding as of September 30, 2023 | 7 years 3 months 18 days |
Exercisable as of September 30, 2023 | 5 years 21 days |
Vested and expected to vest at September 30, 2023 | 7 years 3 months 18 days |
Aggregate Intrinsic Value |  |
Exercised | $ | $ 190 |
Outstanding as of September 30, 2023 | $ | 10,191 |
Exercisable as of September 30, 2023 | $ | 8,068 |
Vested and expected to vest at September 30, 2023 | $ | $ 10,191 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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