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Schedule II - Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts and returns    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Beginning Balance $ 28 $ 33
Charges to Revenue/ Expense 0 30
Deductions 20 35
Ending Balance 8 28
Reserve for excess, obsolete, and slow moving inventories    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Beginning Balance 3,518 4,085
Charges to Revenue/ Expense 0 814
Deductions 624 1,381
Ending Balance 2,894 3,518
Valuation allowance for deferred tax assets    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Beginning Balance 14,390 12,822
Charges to Revenue/ Expense 1,973 1,568
Deductions 0 0
Ending Balance $ 16,363 $ 14,390