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Accounts Receivable, net - Summary of accounts receivable, net (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Government segment: |  |
Accounts receivable-net | $ 41,774 | $ 26,219
Government |  |
Government segment: |  |
Accounts receivable-net | 11,000 | 8,537
Government | Billed |  |
Government segment: |  |
Accounts receivable-net | 11,608 | 9,100
Government | Advanced billings |  |
Government segment: |  |
Accounts receivable-net | (608) | (563)
Restaurant/Retail |  |
Government segment: |  |
Accounts receivable-net | $ 30,774 | $ 17,682

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