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Revenue Recognition - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Performance obligation, contract term | 12 |
Retained earnings | $ 5,427,000 | $ 29,549,000
ASU 2014-09 | Impact after Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Retained earnings | $ 0 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Payment period | 30 days |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Payment period | 90 days |

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