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Clinical Trial and Sponsored Research Agreements (Sponsored Research and Clinical Trial Agreements) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense | $ 9,477 | $ 15,419 | $ 34,313 | $ 46,872
Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense | 364 | 1,836 | 3,739 | 4,884
Mayo Clinic [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense |  | 269 | 551 | 731
CD123 (MB-102) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense | 23 | 63 | 23 | 165
IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense | 180 | 192 | 817 | 654
CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense |  | 187 | 188 | 287
HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense |  | 691 | 0 | 1,233
PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense |  | 27 | 44 | 77
CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense | 142 | 132 | 1,239 | 978
RAG1 SCID (MB-110) [Member] | Leiden University Medical Centre [Member] | Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |
License, Clinical Trial and Sponsored Research Agreements |  |  |  |
Research and development expense | $ 125 | $ 92 | $ 349 | $ 357

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- Definition The costs incurred 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 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, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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