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