Basis of presentation and significant accounting policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Significant Accounting Policies [Line Items]
Allowance for credit losses	$ 0	$ 0	$ 0
ImpairmentLongLivedAssetHeldForUseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag	true
Impairment of long-lived assets	$ 3,131	0	0
Cost related to charitable care	$ 5,449	4,389	2,692
Expected dividend yield	0.00%
Percent of employer matching contribution	50.00%
Contributions	$ 2,379	2,206	2,375
Pension expense	3,878	3,857	2,672
Severance costs	$ 1,992	$ 1,679	$ 1,735
Options
Significant Accounting Policies [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
Shipping and Handling
Significant Accounting Policies [Line Items]
Direct costs included in sales and marketing costs	$ 4,263	$ 3,258	$ 2,871
Minimum | Restricted Share Unit
Significant Accounting Policies [Line Items]
Stock awards granted, vesting period	2 years
Minimum | Options
Significant Accounting Policies [Line Items]
Stock awards granted, vesting period	2 years
Minimum | Field equipment under operating leases
Significant Accounting Policies [Line Items]
Property and equipment useful life	48 months
Maximum
Significant Accounting Policies [Line Items]
Employer matching contribution, percent of employees' annual salary	3.00%
Maximum | Restricted Share Unit
Significant Accounting Policies [Line Items]
Stock awards granted, vesting period	3 years
Maximum | Options
Significant Accounting Policies [Line Items]
Stock awards granted, vesting period	4 years
Maximum | Field equipment under operating leases
Significant Accounting Policies [Line Items]
Property and equipment useful life	60 months