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Accounts Receivable, net - Summary of Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable – net | $ 42,980 | $ 41,774
Government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable – net | 10,277 | 11,000
Government | Billed |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable – net | 11,225 | 11,608
Government | Advanced billings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable – net | 948 | 608
Restaurant/Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable – net | $ 32,703 | $ 30,774

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