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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 20 $ 25 $ 25
Charged to Costs and Expenses 8 14 0
Net (Write-Offs)/ Recoveries (12) (19) 0
Balance at End of Period 16 20 25
Deferred tax asset valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 1,818 2,794 5,447
Charged to Costs and Expenses 0 0 0
Net (Write-Offs)/ Recoveries 0 (976) (2,653)
Balance at End of Period $ 1,818 $ 1,818 $ 2,794