Supplemental Balance Sheet and Income Statement Information - Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in accumulated other comprehensive income (loss)
Beginning balance	$ 326,614
Other comprehensive income (loss), net of tax	418	$ 206	$ (404)
Ending balance	134,996	326,614
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income (loss)
Beginning balance	(10,832)	(11,038)
Other comprehensive income (loss) before reclassifications	256	45
Amounts reclassified from accumulated other comprehensive income (loss)	162	161
Other comprehensive income (loss), net of tax	418	206
Ending balance	(10,414)	(10,832)	(11,038)
Gains (losses) on cash flow hedges
Changes in accumulated other comprehensive income (loss)
Beginning balance	2	2
Ending balance	2	2	2
Defined benefit pension plan items
Changes in accumulated other comprehensive income (loss)
Beginning balance	(3,606)	(3,767)
Amounts reclassified from accumulated other comprehensive income (loss)	162	161
Other comprehensive income (loss), net of tax	162	161
Ending balance	(3,444)	(3,606)	(3,767)
Foreign currency items
Changes in accumulated other comprehensive income (loss)
Beginning balance	(7,228)	(7,273)
Other comprehensive income (loss) before reclassifications	256	45
Other comprehensive income (loss), net of tax	256	45
Ending balance	$ (6,972)	$ (7,228)	$ (7,273)