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Summary of Significant Accounting Policies - Research and Development (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Research and Development |  |  |
Customer-funded service sales | $ 2,621 | $ 1,400 | $ 3,002
Customer-funded costs included in costs of service sales | $ 1,510 | $ 498 | $ 1,546

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- Definition Customer Funded Sales Revenue, Services, Net + References No definition available. + Details
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- References No definition available. + Details
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