Income Taxes - Summary of Deferred Tax Asset and Liabilities, as Reported in the Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Summary of Deferred Tax Assets and Liabilities, as Reported in the Balance Sheet [Abstract]
Net current deferred tax assets	$ 0		$ 0
Net non-current deferred tax liabilities	(49)	$ (13,167)	(13,243)
Total net deferred tax liabilities:	$ (49)		$ (13,243)