Quarterly report pursuant to Section 13 or 15(d)

Clinical Trial and Sponsored Research Agreements (Other - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details)

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Clinical Trial and Sponsored Research Agreements (Other - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 08, 2021
Jul. 03, 2017
Jan. 31, 2022
Jun. 30, 2021
Nov. 30, 2020
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
Fred Hutchinson Cancer Research Center [Member] | Sponsored Research and Clinical Trial Agreements [Member] | CD20 (MB-106) [Member]                  
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                  
Milestones payable   $ 5,300              
Additional milestone payments     $ 2,200   $ 1,800        
Research and development expense           358 327 846 998
St. Jude Children's Research Hospital [Member] | Sponsored Research and Clinical Trial Agreements [Member] | ST. Jude - XSCID [Member]                  
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                  
Research and development expense           94 176 218 280
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
Mayo Clinic [Member] | Sponsored Research and Clinical Trial Agreements [Member] | Car T Technology [Member]                  
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                  
Milestones payable       $ 2,100          
Agreement term       2 years          
Leiden University Medical Centre [Member] | Sponsored Research and Clinical Trial Agreements [Member] | RAG1 SCID (MB-110) [Member]                  
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                  
Annual maintenance fee payable $ 500                
Research and development expense           $ 138 $ 0 $ 265 $ 0
Agreement term 5 years