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Revenue Recognition - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Retained earnings | $ 28,294,000 | $ 29,549,000
Impact after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Retained earnings | $ 0 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Performance obligations, period | 12 months |
Payment period | 30 days |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Performance obligations, period | 60 months |
Payment period | 90 days |

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