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Description of business and summary of significant accounting policies - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Summary of Significant Accounting Policies [Line Items]        
Number of operating segments | segment   1    
Deferred revenue $ 13,200 $ 15,300 $ 13,200  
Service period   4 years    
Advertising expenses   $ 145,600 139,700 $ 94,700
Estimated useful lives of intangible assets (up to)   10 years    
Impairment and abandonment charges for leases and leasehold improvements   $ 117,315 $ 0 $ 0
Impairment charges for intangible assets $ 9,400      
2019 Plan | Minimum        
Summary of Significant Accounting Policies [Line Items]        
Service period   2 years    
2019 Plan | Maximum        
Summary of Significant Accounting Policies [Line Items]        
Service period   4 years    
RSUs | 2009 Plan        
Summary of Significant Accounting Policies [Line Items]        
Service period   4 years