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Accounts Receivables & Allowance for Doubtful Receivables - Summary of changes in the Allowance for Doubtful Finance Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts Receivable Net [Abstract]        
Beginning balance $ 96 $ 40 $ 40 $ 65
Provision for bad debt 253 4 399 75
Write-offs (96) (4) (186) (100)
Recoveries 14 0 14 0
Net write-offs (83) (4) (173) (100)
Ending balance $ 266 $ 40 $ 266 $ 40