Description of business and summary of significant accounting policies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of operating segments | segment	1
Deferred revenue	$ 47,500	$ 23,400
Advertising expenses	$ 168,800	161,500	$ 145,600
Estimated useful lives of intangible assets (up to)	10 years
Impairment and abandonment charges for leases and leasehold improvements	$ 0	$ 0	$ 117,315
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