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Schedule II - Valuation and Qualifying Accounts - (Details) - Accounts receivable allowance - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 357 $ 270 $ 293
Charged to Costs and Expenses (156) 216 73
Charged to Other Accounts 0 (129) 0
Uncollectible Accounts Written-off (101) 0 (96)
Balance at End of Period $ 100 $ 357 $ 270