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License, Clinical Trial and Sponsored Research Agreements (City of Hope - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 01, 2020 USD ($) | Jul. 03, 2017 USD ($) | Nov. 30, 2020 USD ($) | Oct. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Feb. 28, 2017 USD ($) | Mar. 31, 2015 USD ($) installment | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | $ 14,083,000 | $ 7,987,000 | $ 36,603,000 | $ 27,131,000
Sponsored Research and Clinical Trial Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 1,756,000 | 734,000 | 4,858,000 | 4,900,000
Sponsored Research and Clinical Trial Agreements [Member] | City of Hope National Medical Center ("COH") [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |
Number of installments | installment |  |  |  |  |  |  |  | 4 |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 500,000
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] |  |  |  |  |  |  |  |  |  |  |  |
Upfront fees paid |  |  |  |  |  |  | $ 19,450 |  |  |  |  |
Contribution toward patient costs |  |  |  |  |  |  | 200,000 |  |  |  |  |
Contribution per patient |  |  |  |  |  |  | $ 97,490 |  |  |  |  |
Agreement term |  |  |  |  |  |  | 3 years |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 24,000 | 48,000 | 250,000 | 344,000
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] |  |  |  |  |  |  |  |  |  |  |  |
Upfront fees paid |  |  |  | $ 29,000 |  |  | $ 9,300 |  |  |  |  |
Milestones payable |  |  |  |  |  |  | 200,000 |  |  |  |  |
Additional milestone payments |  |  |  |  |  |  | $ 100,000 |  |  |  |  |
Contribution per patient |  |  |  | 100,000 |  |  |  |  |  |  |  |
Agreement term |  |  |  |  |  |  | 3 years |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 199,000 | 96,000 | 992,000 | 422,000
Annual maintenance fee payable |  |  |  | 200,000 |  |  |  |  |  |  |  |
Sponsored Research and Clinical Trial Agreements [Member] | IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contribution toward patient costs |  |  |  |  |  |  |  |  |  |  | 200,000 |
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] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  |  | $ 800,000 |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 138,000 | 65,000 | 510,000 | 835,000
Sponsored Research and Clinical Trial Agreements [Member] | CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  |  | $ 2,400,000 |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  | $ 29,375 |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 319,000 | 0 | 473,000 | 0
Sponsored Research and Clinical Trial Agreements [Member] | HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  | 33,000 |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 23,000 | 0 | 69,000 | 0
Sponsored Research and Clinical Trial Agreements [Member] | PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |
Sponsored Research and Clinical Trial Agreements [Member] | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Research Center [Member] |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestones payable |  | $ 5,300,000 |  |  |  |  |  |  |  |  |  |
Additional milestone payments |  |  | $ 800,000 |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | 492,000 | 418,000 | 1,490,000 | 1,134,000
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] |  |  |  |  |  |  |  |  |  |  |  |
Upfront fees paid | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  | $ 330,000 | $ 107,000 | $ 610,000 | $ 1,665,000

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