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Supplemental Consolidated Financial Statement Information - Allowance for Doubtful Accounts (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Allowance for doubtful accounts  
Beginning Balance $ (250)
Additional provisions to allowance (1,625)
Accounts Receivable.  
Allowance for doubtful accounts  
Write-offs against allowance 191
Notes Receivable  
Allowance for doubtful accounts  
Write-offs against allowance $ 1,434