Basis of presentation and significant accounting policies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Significant Accounting Policies [Line Items]
Allowance for credit losses	$ 0	$ 0	$ 0
Inventory write-offs	756	681	917
Impairment of long-lived assets	0	0	0
Cost related to charitable care	$ 4,389	2,692	3,009
Expected dividend yield	0.00%
Percent of employer matching contribution	50.00%
Contributions	$ 2,206	2,375	2,083
Pension expense	3,857	2,672	2,104
Severance costs	$ 1,679	$ 1,735	$ 1,594
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	$ 3,258	$ 2,871	$ 3,211
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	18 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