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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Credit loss allowance for accounts receivable      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 16 $ 20 $ 25
Charged to Costs and Expenses 8 14
Net (Write-Offs)/ Recoveries (4) (12) (19)
Balance at End of Period 12 16 20
Deferred tax asset valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 1,818 1,818 2,794
Charged to Costs and Expenses 0 0 0
Net (Write-Offs)/ Recoveries $ (1,818) 0 (976)
Balance at End of Period   $ 1,818 $ 1,818