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License, Clinical Trial and Sponsored Research Agreements (License Agreements) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | $ 630,000 | $ 287,000 | $ 1,630,000 | $ 1,837,000
License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 630,000 | 287,000 | 1,630,000 | 1,837,000
Leiden University Medical Centre [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 350,000 | 0 | 350,000 | 0
CD123 (MB-102) [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 0 | 0 | 250,000 | 334,000
IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 0 | 0 | 0 | 333,000
Spacer [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 0 | 0 | 0 | 333,000
PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 250,000 | 0 | 250,000 | 0
HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 0 | 0 | 0 | 250,000
CD20 (MB-106) [Member] | Fred Hutchinson Cancer Research Center [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 0 | 0 | 0 | 300,000
XSCID (MB-107 and MB-207) [Member] | CSL Behring (Calimmune) [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 30,000 | 170,000 | 30,000 | 170,000
Car T Technology [Member] | Mayo Clinic [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | 0 | 0 | 750,000 | 0
LentiBOOST Technology [Member] | SIRION Biotech [Member] | License Agreements [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development for licenses acquired | $ 0 | $ 117,000 | $ 0 | $ 117,000

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