Inventories - Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of period	$ 2,007	$ 2,304	$ 1,787	$ 3,261
Provision (recovery of) for excess and obsolete inventories	(72)	486	148	292
Inventories written off	(64)	(64)	(64)	(827)
Balance, end of period	$ 1,871	$ 2,726	$ 1,871	$ 2,726