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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 187,232 | $ 201,246
Restaurant | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 93,857 | 101,260
Restaurant | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 29,450 | 32,809
Restaurant | Restaurant | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 92,702 | 98,353
Restaurant | Restaurant | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 27,224 | 29,713
Restaurant | Grocery | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,155 | 2,907
Restaurant | Grocery | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,226 | 3,096
Restaurant | Mission Systems | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Restaurant | Mission Systems | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Restaurant | ISR Solutions | Point in Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Restaurant | ISR Solutions | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Government | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 63,925 | 67,177
Government | Restaurant | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Government | Grocery | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Government | Mission Systems | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 33,512 | 34,796
Government | ISR Solutions | Over Time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 30,413 | $ 32,381

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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