Quarterly report pursuant to Section 13 or 15(d)

Clinical Trial and Sponsored Research Agreements (Sponsored Research and Clinical Trial Agreements) (Details)

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Clinical Trial and Sponsored Research Agreements (Sponsored Research and Clinical Trial Agreements) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense $ 15,164 $ 10,902 $ 31,453 $ 22,520
Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 1,456 1,260 3,048 3,102
City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 0 0 0 0
Mayo Clinic [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 231 233 462 233
CD123 (MB-102) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 52 21 103 226
IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 234 279 462 793
CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 50 197 100 372
HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 271 31 542 154
PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 28   50 46
Research and Development (Income) Expenses   (4)    
CD20 (MB-106) [Member] | Fred Hutchinson Cancer Research Center [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 358 327 846 998
ST. Jude - XSCID [Member] | St. Jude Children's Research Hospital [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense 94 176 218 280
RAG1 SCID (MB-110) [Member] | Leiden University Medical Centre [Member] | Sponsored Research and Clinical Trial Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development expense $ 138 $ 0 $ 265 $ 0