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Summary of business and significant accounting policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Nov. 24, 2020
Jan. 01, 2018
Apr. 12, 2017
Property, Plant and Equipment [Line Items]                    
Restricted Cash $ 0   $ 0       $ 2,000      
Allowance for Doubtful Other Receivables, Current           $ 500 800      
Operating Lease, Impairment Loss 0 $ 12,460 0 $ 12,460            
Deferred Revenue, Revenue Recognized 6,600 3,200 24,600 12,900            
Advertising Expense     34,100 $ 67,300 $ 73,000          
Accumulated deficit (331,971)   $ (331,971)       (650,516)      
Product Warranty Liability [Line Items]                    
Warranty Period     12 months              
Deferred Revenue, Revenue Recognized 13,800 $ 5,600                
Contract with Customer, Liability $ 38,500   $ 38,500       $ 29,300      
Cumulative effect of adoption of new accounting standard [Member]                    
Property, Plant and Equipment [Line Items]                    
Accumulated deficit                 $ 15,000  
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     2 years