Schedule II - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts and returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 8	$ 28
Charges to Revenue/ Expense	6	0
Deductions	0	20
Ending Balance	14	8
Inventory reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	2,894	3,518
Charges to Revenue/ Expense	281	0
Deductions	125	624
Ending Balance	3,050	2,894
Valuation allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	16,363	14,390
Charges to Revenue/ Expense	2,568	1,973
Deductions	0	0
Ending Balance	$ 18,931	$ 16,363