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- Schedule of revenue by major customers (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Revenue, Major Customer [Line Items] |  |
Percentage of revenue generated by customer | 100.00% | 100.00%
Restaurant/Retail | McDonald’s Corporation | Reportable Segments |  |
Revenue, Major Customer [Line Items] |  |
Percentage of revenue generated by customer | 33.00% | 25.00%
Restaurant/Retail | Yum! Brands, Inc. | Reportable Segments |  |
Revenue, Major Customer [Line Items] |  |
Percentage of revenue generated by customer | 14.00% | 11.00%
Government | U.S. Department of Defense | Reportable Segments |  |
Revenue, Major Customer [Line Items] |  |
Percentage of revenue generated by customer | 26.00% | 35.00%
Other |  |
Revenue, Major Customer [Line Items] |  |
Percentage of revenue generated by customer | 27.00% | 29.00%

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