Commitments and contingencies (Details) - USD ($)	Jan. 27, 2026	Dec. 31, 2025	Dec. 31, 2024	Jan. 30, 2024	Sep. 13, 2022
Loss Contingencies [Line Items]
Contractual obligation		$ 700,000
Leases not yet commenced		9,500,000	$ 6,900,000
Letters of credit outstanding,		0
Estimated range of loss in excess of amounts accrued		$ 253,000,000
Estimate of possible loss amount				$ 1,200,000	$ 1,900,000
Subsequent Event
Loss Contingencies [Line Items]
Payment of fine	$ 1,200,000