SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation allowance on net deferred tax assets
Valuation Allowances and Reserves
Balance at beginning of period	$ 21,198	$ 16,990	$ 11,438
Charged to costs and expense	7,581	4,208	5,552
Balance at end of period	28,779	21,198	16,990
Allowance for slow moving or obsolete inventory
Valuation Allowances and Reserves
Balance at beginning of period	100	100	100
Charged to costs and expense	317	521	985
Deductions	(317)	(521)	(985)
Balance at end of period	$ 100	$ 100	$ 100