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Revenue Recognition - Performance Obligation (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | $ 11,082 | $ 12,486 | $ 12,813
Current under one year |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 9,506 | 12,084 |
Current under one year | Restaurant/Retail |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 9,506 | 12,084 |
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 | 3,082 | 3,916 |
Non-current over one year | Restaurant/Retail |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | 3,082 | 3,916 |
Non-current over one year | Government |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligations | $ 0 | $ 0 |

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