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Clinical Trial and Sponsored Research Agreements (Tables) | 3 Months Ended
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Mar. 31, 2022
Sponsored Research and Clinical Trial Agreements [Member] |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
Schedule of Clinical Trial and Sponsored Research Agreements | For the three months ended March 31, 2022 and 2021, the Company recorded the following expense in research and development for sponsored research and clinical trial agreements in the Unaudited Condensed Statements of Operations pursuant to the terms of this agreement: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended March 31,
($ in thousands) |  | 2022 |  | 2021
City of Hope National Medical Center | ​ | $ | — | ​ | $ | —
CD123 | ​ | ​ | 51 | ​ | ​ | 205
IL13Rα2 | ​ | ​ | 228 | ​ | ​ | 514
CS1 | ​ | ​ | 50 | ​ | ​ | 175
HER2 | ​ | ​ | 271 | ​ | ​ | 123
PSCA | ​ | ​ | 22 | ​ | ​ | 50
Fred Hutchinson Cancer Research Center - CD20 | ​ | ​ | 488 | ​ | ​ | 671
St. Jude Children's Research Hospital - XSCID | ​ | ​ | 124 | ​ | ​ | 104
LUMC - RAG1 SCID | ​ | ​ | 127 | ​ | ​ | —
Mayo Clinic | ​ | ​ | 231 | ​ | ​ | —
Total | ​ | $ | 1,592 | ​ | $ | 1,842

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- Definition Tabular disclosure of collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 808 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434 + Details
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