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Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts Receivable [Abstract] |  |
Accounts receivable – net | $ 48,902 | $ 42,980
Government |  |
Accounts Receivable [Abstract] |  |
Accounts receivable – net | 10,919 | 10,277
Restaurant/Retail |  |
Accounts Receivable [Abstract] |  |
Accounts receivable – net | 37,983 | 32,703
Billed | Government |  |
Accounts Receivable [Abstract] |  |
Accounts receivable – net | 10,919 | 11,225
Advanced billings | Government |  |
Accounts Receivable [Abstract] |  |
Accounts receivable – net | $ 0 | $ (948)

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