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Revenue Recognition - Performance Obligation (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | $ 20,046 | $ 11,082 | $ 12,486
Restaurant/Retail |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 20,000 | 11,100 |
Current under one year |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 12,449 | 8,000 |
Current under one year | Restaurant/Retail |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 12,449 | 8,000 |
Current under one year | Government |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 0 | 0 |
Non-current over one year |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 7,597 | 3,082 |
Non-current over one year | Restaurant/Retail |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 7,597 | 3,082 |
Non-current over one year | Government |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | $ 0 | $ 0 |

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 + Details
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