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Summary of business and significant accounting policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Jan. 01, 2022
Dec. 31, 2021
Nov. 24, 2020
Apr. 12, 2017
Property, Plant and Equipment [Line Items]                  
Restricted Cash $ 0   $ 0       $ 0    
Allowance for Doubtful Other Receivables, Current 700   700       700    
Operating Lease, Impairment Loss       $ 12,500          
Contract with Customer, Liability 53,900   53,900       48,500    
Deferred Revenue, Revenue Recognized 9,000 $ 6,600 37,900 24,600          
Advertising Expense     35,800 $ 34,100 $ 67,300        
Accumulated deficit (199,186)   $ (199,186)     $ 47,100 $ (279,345)    
Product Warranty Liability [Line Items]                  
Warranty Period     12 months            
Deferred Revenue, Revenue Recognized $ 18,400 $ 13,300              
Convertible Senior Notes due 2022 [Member]                  
Property, Plant and Equipment [Line Items]                  
Interest rate                 3.50%
Debt Instrument                 $ 175,000
Convertible Senior Notes due 2025 [Member]                  
Property, Plant and Equipment [Line Items]                  
Interest rate               1.25%  
Debt Instrument               $ 143,800  
Europe [Member]                  
Product Warranty Liability [Line Items]                  
Warranty Period     24 months