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Intangible assets (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2018
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Intangible assets        
Amortization of acquired intangible asset   $ 100 $ 793 $ 1,177
Cost of sales - sale of COPIKTRA license and related assets   31,187 31,187  
Acquired and in-license rights        
Intangible assets        
Milestone payment payable   22,000 22,000  
Payments for milestone payment $ 22,000      
Secura | Intangible asset | Copiktra license and related assets        
Intangible assets        
Cost of sales - sale of COPIKTRA license and related assets   $ 19,200 $ 19,200