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Fixed assets - Summary of Fixed Assets, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property Plant And Equipment [Line Items]    
Fixed assets $ 3,717 $ 3,683
Less: accumulated depreciation and amortization 2,329 1,741
Fixed assets, net 1,388 1,942
Furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Fixed assets 1,407 1,407
Computer and office equipment [Member]    
Property Plant And Equipment [Line Items]    
Fixed assets 1,855 1,784
Computer software [Member]    
Property Plant And Equipment [Line Items]    
Fixed assets 375 412
Leasehold improvements [Member]    
Property Plant And Equipment [Line Items]    
Fixed assets $ 80 $ 80