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Collaboration and Licensing Agreements - Narrative (Details)
¥ in Billions
1 Months Ended 3 Months Ended 53 Months Ended
Nov. 30, 2019
USD ($)
item
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Apr. 11, 2022
USD ($)
payment_tranche
Mar. 31, 2022
JPY (¥)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revenue           $ 468,000 $ 6,582,000      
Cost of revenue           85,000 1,000,000      
Licensing revenue                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revenue           4,000 5,002,000      
Product supply revenue                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revenue           14,000 126,000      
AstraZeneca                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Aggregate cost of revenue recognized           11,700,000   $ 11,700,000    
2019 KKC Agreement                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revenue           0 1,500,000      
2019 KKC Agreement | KKC                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Upfront license fees $ 10,000,000                  
First installment of upfront license fees $ 5,000,000                  
Term of payment of license fee, first installment 30 days                  
Second installment of upfront license fees $ 5,000,000                  
Term of agreement 2 years                  
2019 KKC Agreement | KKC | Minimum                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Number of separate collaborative agreements | item 1                  
2017 KKC Agreement | Licensing revenue                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revenue           0 5,000,000 10,000,000    
2017 KKC Agreement | Product supply revenue                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revenue           14,000 100,000      
2017 KKC Agreement | KKC                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Upfront license fees       $ 30,000,000            
Potential development milestones       $ 55,000,000            
Potential commercialization milestones           69,700,000   69,700,000   ¥ 8.5
Fosun Agreement                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revenue           0 0      
Fosun Agreement | Fosun Pharma                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Upfront payment received     $ 12,000,000              
Potential development and commercialization milestones           $ 110,000,000        
Threshold percentage of net sales for tiered royalties           20.00%        
Knight Agreement | Knight                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Upfront payment received   $ 2,300,000                
Potential development and commercialization milestones           $ 17,800,000        
AZ Termination Agreement | AstraZeneca                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Percentage of royalty revenue         10.00%          
Percentage of non-royalty revenue         20.00%          
Maximum potential payment per agreement         $ 75,000,000          
Cost of revenue           100,000 $ 1,000,000      
Aggregate amount paid           $ 11,600,000   $ 11,600,000    
Subsequent event | 2017 KKC Agreement | KKC                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Fee receivable for reduction in royalty rate                 $ 40,000,000  
Number of payment tranches for fee receivable for reduction in royalty rate | payment_tranche                 2