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Summary of Significant Accounting Policies - License Agreements (Details) - Rare Stone Group Ltd [Member]
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
item
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
project
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Significant Agreements                
Realized loss on RareStone equity     $ 1,040          
Loss on RareStone equity investment     $ 300 $ 300        
Upfront consideration $ 8,040              
Contract with customer liability revenue recognized   $ 0     $ 0      
Number of independent sub studies in patients | project         4      
Upfront payment 7,000              
Equity recorded at fair value 1,040     $ 1,040       $ 2,440
Aggregate payment upon achievement of development and commercial milestones $ 62,500              
Shares issued for license agreement (in shares) | shares 1,077,586              
License agreement                
Significant Agreements                
Number of performance obligations | item 2              
License agreement commercial manufacturing supply discount         $ 1,286   $ 1,286  
Contract with customer liability revenue recognized           $ 6,754