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Collaboration Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Feb. 13, 2024
Related Party Transaction [Line Items] |  |  |
Collaboration revenue | $ 1,657 | $ 652 |
Research and development | 74,310 | 82,899 |
Collaborative Arrangement | ImmunoGen |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue, remaining performance obligation, amount | 2,000 |  |
Collaboration revenue | $ 1,700 | $ 700 |
Collaborative Arrangement | The Ono Agreement | Subsequent Event |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue, remaining performance obligation, amount |  |  | $ 5,400
Revenue, remaining performance obligation, variable consideration amount |  |  | $ 224,500
Revenue, remaining performance obligation, timing of termination |  |  | 90 days

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 730 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482916/730-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 912 -SubTopic 730 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482517/912-730-25-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
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