Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal tax loss carry-forward	$ 10,174	$ 14,632
U.S. State tax loss carry-forward	766	1,505
U.S. federal capital loss carry-forward		188
Equity based compensation	3,117	3,956
Fixed assets, intangible assets and goodwill	496	821
Long-term investments	870	462
Total deferred tax assets	15,423	21,573
Less: valuation allowance	(15,423)	(21,573)
Net deferred tax asset