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Clinical Trial and Sponsored Research Agreements (City of Hope - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 08, 2021 | Jul. 03, 2017 | Jan. 31, 2022 | Nov. 30, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Feb. 28, 2017 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | $ 15,419 | $ 14,083 | $ 46,872 | $ 36,603
Leiden University Medical Centre [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Upfront fees paid |  |  |  |  |  |  |  |  | 0 | 400 | 0 | 400
Mayo Clinic [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Upfront fees paid |  |  |  |  |  |  |  |  | 0 | 800 | 0 | 800
Total reimbursement payments made |  |  |  |  |  |  |  |  | 1,400 |  | 1,400 |
PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement payments made |  |  |  |  |  |  |  |  | 300 |  | 300 |
HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement payments made |  |  |  |  |  |  |  |  | 2,500 |  | 2,500 |
CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement payments made |  |  |  |  |  |  |  |  | 6,200 |  | 6,200 |
ST. Jude - XSCID [Member] | St. Jude Children's Research Hospital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement payments made |  |  |  |  |  |  |  |  | 3,000 |  | 3,000 |
Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 1,836 | 1,756 | 4,884 | 4,858
Sponsored Research and Clinical Trial Agreements [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Sponsored Research and Clinical Trial Agreements [Member] | Mayo Clinic [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 269 | 231 | 731 | 464
Sponsored Research and Clinical Trial Agreements [Member] | CD123 (MB-102) [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contribution per patient |  |  |  |  |  |  |  | $ 100 |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 62 | 24 | 165 | 250
Sponsored Research and Clinical Trial Agreements [Member] | CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 187 | 138 | 287 | 510
Total reimbursement payments made |  |  |  |  |  |  |  |  | 1,500 |  | 1,500 |
Sponsored Research and Clinical Trial Agreements [Member] | CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  |  |  | $ 2,400 |  |  |  |  |
Sponsored Research and Clinical Trial Agreements [Member] | IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contribution toward patient costs |  |  |  |  |  |  |  | $ 100 |  |  |  |
Contribution per patient |  |  |  |  | $ 100 |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 192 | 199 | 654 | 992
Annual maintenance fee payable |  |  |  |  | 200 |  |  |  |  |  |  |
Sponsored Research and Clinical Trial Agreements [Member] | IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contribution toward patient costs |  |  |  |  |  |  |  |  |  |  | 200 |
Sponsored Research and Clinical Trial Agreements [Member] | PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 27 |  | 77 | 69
Sponsored Research and Clinical Trial Agreements [Member] | PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  | $ 2,300 |  |  |  |  |  |  |
Sponsored Research and Clinical Trial Agreements [Member] | HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 691 | 319 | 1,233 | 473
Sponsored Research and Clinical Trial Agreements [Member] | HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  |  | $ 3,000 |  |  |  |  |  |
Sponsored Research and Clinical Trial Agreements [Member] | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  | $ 5,300 |  |  |  |  |  |  |  |  |  |
Additional milestone payments |  |  | $ 2,200 | $ 1,800 |  |  |  |  |  |  |  |
Contribution toward patient costs |  |  |  | $ 800 |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 132 | 492 | 978 | 1,490
Sponsored Research and Clinical Trial Agreements [Member] | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional milestone payments |  |  | $ 9,300 |  |  |  |  |  |  |  |  |
Sponsored Research and Clinical Trial Agreements [Member] | ST. Jude - XSCID [Member] | St. Jude Children's Research Hospital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 184 | 330 | 402 | 610
Sponsored Research and Clinical Trial Agreements [Member] | RAG1 SCID (MB-110) [Member] | Leiden University Medical Centre [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Agreement term | 5 years |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | $ 92 | $ 0 | $ 357 | $ 0
Annual maintenance fee payable | $ 500 |  |  |  |  |  |  |  |  |  |  |

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