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Summary of significant accounting policies - Equipment, Intangibles (Details)
12 Months Ended
Oct. 01, 2021
USD ($)
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]        
Impairment of long-lived assets   $ 0 $ 0 $ 0
Number of reporting units | item   1    
Goodwill, impairment loss $ 0      
Impairment of intangible assets, finite-lived   $ 0 $ 0 $ 0
Impairment of intangible assets, indefinite-lived (excluding goodwill)   $ 0    
Minimum        
Property, Plant and Equipment [Line Items]        
Useful life   2 years    
Maximum        
Property, Plant and Equipment [Line Items]        
Useful life   12 years    
Computers | Minimum        
Property, Plant and Equipment [Line Items]        
Useful life   3 years    
Computers | Maximum        
Property, Plant and Equipment [Line Items]        
Useful life   5 years    
Software        
Property, Plant and Equipment [Line Items]        
Useful life   3 years    
Furniture/fixtures | Minimum        
Property, Plant and Equipment [Line Items]        
Useful life   5 years    
Furniture/fixtures | Maximum        
Property, Plant and Equipment [Line Items]        
Useful life   7 years