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Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Accounts Receivable [Abstract] |  |  |  |
Accounts receivable - net | $ 38,236 | $ 41,774 |  |
Government |  |  |  |
Accounts Receivable [Abstract] |  |  |  |
Accounts receivable - net | 8,600 | 11,000 |  |
Restaurant/Retail |  |  |  |
Accounts Receivable [Abstract] |  |  |  |
Accounts receivable - net | 29,636 | 30,774 |  |
Allowance for doubtful accounts | 2,048 | 1,849 | $ 1,708 | $ 1,351
Billed | Government |  |  |  |
Accounts Receivable [Abstract] |  |  |  |
Accounts receivable - net | 9,091 | 11,608 |  |
Advanced billings | Government |  |  |  |
Accounts Receivable [Abstract] |  |  |  |
Accounts receivable - net | $ (491) | $ (608) |  |

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