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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Schedule of Performance Obligations | The aggregate uncompleted performance obligations attributable to each of the Company's reporting segments is as follows (in thousands):
| December 31, 2020 |  | December 31, 2019
| Current under one year |  | Non-current over one year |  | Current under one year |  | Non-current over one year
Restaurant/Retail | $ | 9,506 |  |  | $ | 3,082 |  |  | $ | 12,084 |  |  | $ | 3,916 |
Government | — |  |  | — |  |  | — |  |  | — |
TOTAL | $ | 9,506 |  |  | $ | 3,082 |  |  | $ | 12,084 |  |  | $ | 3,916 |
The changes in deferred revenue, inclusive of both current and long-term, are as follows:
(in thousands) | 2020 |  | 2019
Beginning balance - January 1 | $ | 12,486 |  |  | $ | 12,813 |
Recognition of deferred revenue | (11,005) |  |  | (7,800) |
Deferral of revenue | 9,601 |  |  | 7,473 |
Ending balance - December 31 | $ | 11,082 |  |  | $ | 12,486 |
Schedule of Disaggregated Revenue | Disaggregated revenue is as follows (in thousands):
| Year Ended December 31, 2020
| Restaurant/Retail Point in Time |  | Restaurant/Retail Over Time |  | Government Over Time
Restaurant | $ | 73,228 |  |  | $ | 69,284 |  |  | $ | — |
ISR Solutions | — |  |  | — |  |  | 38,327 |
Mission Systems | — |  |  | — |  |  | 32,947 |
TOTAL | $ | 73,228 |  |  | $ | 69,284 |  |  | $ | 71,274 |
| Year Ended December 31, 2019
| Restaurant/Retail Point in Time |  | Restaurant/Retail Over Time |  | Government Over Time
Restaurant | $ | 92,702 |  |  | $ | 27,224 |  |  | $ | — |
Grocery | 1,155 |  |  | 2,226 |  |  | — |
ISR Solutions | — |  |  | — |  |  | 30,413 |
Mission Systems | — |  |  | — |  |  | 33,512 |
TOTAL | $ | 93,857 |  |  | $ | 29,450 |  |  | $ | 63,925 |
| Year Ended December 31, 2018
| Restaurant/Retail Point in Time |  | Restaurant/Retail Over Time |  | Government Over Time
Restaurant | $ | 98,353 |  |  | $ | 29,713 |  |  | $ | — |
Grocery | 2,907 |  |  | 3,096 |  |  | — |
ISR Solutions | — |  |  | — |  |  | 32,381 |
Mission Systems | — |  |  | — |  |  | 34,796 |
TOTAL | $ | 101,260 |  |  | $ | 32,809 |  |  | $ | 67,177 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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