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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Allowance for doubtful accounts:    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Balance at beginning of period $ 654 $ 593
Charged to Costs and Expenses 504 578
Deductions (360) (517)
Balance at end of period 798 654
Valuation allowance for deferred tax assets:    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Balance at beginning of period 1,257 1,235
Charged to Costs and Expenses 0 22
Deductions (1,257) 0
Balance at end of period $ 0 $ 1,257