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Clinical Trial and Sponsored Research Agreements (Tables) | 9 Months Ended
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Sep. 30, 2023
Sponsored Research and Clinical Trial Agreements [Member] |
License, Clinical Trial and Sponsored Research Agreements |
Schedule of Clinical Trial and Sponsored Research Agreements | For the three and nine months ended September 30, 2023 and 2022, the Company recorded the following expense in research and development for sponsored research and clinical trial agreements in the Unaudited Statements of Operations pursuant to the terms of this agreement: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
($ in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
City of Hope National Medical Center | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
CD123 | ​ | $ | 23 | ​ | $ | 63 | ​ | $ | 23 | ​ | $ | 165
IL13Rα2 | ​ | ​ | 180 | ​ | ​ | 192 | ​ | ​ | 817 | ​ | ​ | 654
CS1 | ​ | ​ | — | ​ | ​ | 187 | ​ | ​ | 188 | ​ | ​ | 287
HER2 | ​ | ​ | — | ​ | ​ | 691 | ​ | ​ | — | ​ | ​ | 1,233
PSCA | ​ | ​ | — | ​ | ​ | 27 | ​ | ​ | 44 | ​ | ​ | 77
Fred Hutchinson Cancer Center - CD20 | ​ | ​ | 142 | ​ | ​ | 132 | ​ | ​ | 1,239 | ​ | ​ | 978
St. Jude Children's Research Hospital - XSCID | ​ | ​ | (106) | ​ | ​ | 184 | ​ | ​ | 528 | ​ | ​ | 402
LUMC - RAG1 SCID | ​ | ​ | 125 | ​ | ​ | 92 | ​ | ​ | 349 | ​ | ​ | 357
Mayo Clinic | ​ | ​ | — | ​ | ​ | 269 | ​ | ​ | 551 | ​ | ​ | 731
Total | ​ | $ | 364 | ​ | $ | 1,836 | ​ | $ | 3,739 | ​ | $ | 4,884

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