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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Support contract timing | 12 months |  |  |
Customer deposits | $ 1,600 | $ 1,800 |  |
Performance obligations | 11,076 | 12,478 | $ 11,082 | $ 12,486
Recognition of revenue | $ 2,603 | 4,034 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations, period | 12 months |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations, period | 12 months |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations, period | 12 months |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations, period |  |  |  |
Restaurant and Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Recognition of revenue | $ 2,600 | $ 4,000 |  |
Restaurant and Retail | Current | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligation, percentage | 78.00% |  |  |
Restaurant and Retail | Non-current | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligation, percentage | 100.00% |  |  |
Performance obligations, period | 60 months |  |  |
Government Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations | $ 140,066 |  | 150,500 |
Funded performance obligations | 30,200 |  | $ 27,800 |
Government Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations | 56,238 |  |  |
Government Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations | 47,328 |  |  |
Government Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations | 24,434 |  |  |
Government Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations | $ 12,066 |  |  |
Minimum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Payment period | 30 days |  |  |
Maximum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Payment period | 90 days |  |  |

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