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Basis of Presentation - Change in Accounting Policy (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Jan. 01, 2016
Accounting Changes
Accumulated deficit	$ (475,284)	$ (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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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