Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Basis of Presentation - (Details)

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Description of Business and Basis of Presentation - (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained Earnings $ (120,206)   $ (149,778)
Effects of Change Higher/(Lower) | Accounting Standards Update 2014-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained Earnings $ 25,838 $ 24,109