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Schedule I - Valuation and Qualifying Accounts and Allowances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Valuation Allowance      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Additions during the period $ 1,906    
Balance at End of period 1,906    
Allowance for Doubtful Accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of the period 302 $ 480 $ 40
Additions during the period 526 354 532
Write-offs (388) (532) (92)
Balance at End of period $ 441 $ 302 $ 480