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Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 46,362 | $ 48,938 | $ 154,594 | $ 177,064
Point in Time | Restaurant/Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22,452 |  | 83,673 |
Point in Time | Restaurant/Retail | Restaurant |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 21,761 |  | 81,422 |
Point in Time | Restaurant/Retail | Grocery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 691 |  | 2,251 |
Point in Time | Restaurant/Retail | Mission Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 |  | 0 |
Point in Time | Restaurant/Retail | ISR Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 |  | 0 |
Over Time | Restaurant/Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6,474 |  | 19,600 |
Over Time | Restaurant/Retail | Restaurant |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5,727 |  | 17,258 |
Over Time | Restaurant/Retail | Grocery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 747 |  | 2,342 |
Over Time | Restaurant/Retail | Mission Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 |  | 0 |
Over Time | Restaurant/Retail | ISR Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 |  | 0 |
Over Time | Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 17,436 |  | 51,321 |
Over Time | Government | Restaurant |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 |  | 0 |
Over Time | Government | Grocery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 |  | 0 |
Over Time | Government | Mission Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,283 |  | 25,324 |
Over Time | Government | ISR Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 9,153 |  | $ 25,997 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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