Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.1
Clinical Trial and Sponsored Research Agreements (Other - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Sep. 08, 2021
Jul. 03, 2017
Jan. 31, 2022
Jun. 30, 2021
Nov. 30, 2020
Mar. 31, 2023
Mar. 31, 2022
License, Clinical Trial and Sponsored Research Agreements              
Research and development expense           $ 14,000 $ 16,289
Sponsored Research and Clinical Trial Agreements [Member]              
License, Clinical Trial and Sponsored Research Agreements              
Research and development expense           1,742 1,592
Fred Hutchinson Cancer Center [Member] | CD20 (MB-106) [Member]              
License, Clinical Trial and Sponsored Research Agreements              
Total reimbursement payments made           7,700  
Fred Hutchinson Cancer Center [Member] | Sponsored Research and Clinical Trial Agreements [Member] | CD20 (MB-106) [Member]              
License, Clinical Trial and Sponsored Research Agreements              
Milestones payable   $ 5,300          
Additional milestone payments     $ 2,200   $ 1,800    
Research and development expense           554 488
St. Jude Children's Research Hospital [Member] | ST. Jude - XSCID [Member]              
License, Clinical Trial and Sponsored Research Agreements              
Total reimbursement payments made           3,400  
St. Jude Children's Research Hospital [Member] | Sponsored Research and Clinical Trial Agreements [Member] | ST. Jude - XSCID [Member]              
License, Clinical Trial and Sponsored Research Agreements              
Research and development expense           419 124
Mayo Clinic [Member]              
License, Clinical Trial and Sponsored Research Agreements              
Total reimbursement payments made           1,900  
Mayo Clinic [Member] | Sponsored Research and Clinical Trial Agreements [Member]              
License, Clinical Trial and Sponsored Research Agreements              
Research and development expense           275 231
Mayo Clinic [Member] | Sponsored Research and Clinical Trial Agreements [Member] | Car T Technology [Member]              
License, Clinical Trial and Sponsored Research Agreements              
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]              
License, Clinical Trial and Sponsored Research Agreements              
Research and development expense           $ 112 $ 127
Agreement term 5 years