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Basis of Presentation - Change in Accounting Policy (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2016
--- | --- | --- | ---
Accounting Changes |  |  |
Accumulated deficit | $ (466,331) | $ (212,870) |
Adjustments for adoption of guidance | Accounting Standards Update 2014-09, Revenue from Contracts with Customers |  |  |
Accounting Changes |  |  |
Accumulated deficit |  | $ 506 | $ 6,900

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