Income Taxes - Summary of Deferred Tax Asset and Liabilities, as Reported in the Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Summary of Deferred Tax Assets and Liabilities, as Reported in the Balance Sheet [Abstract]
Net current deferred tax assets	$ 0	$ 2,013
Net non-current deferred tax liabilities	(13,243)	(19,000)
Total net deferred tax liabilities:	$ (13,243)	$ (16,987)