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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

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