Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Expected Statutory expense (benefit)	$ (5,195)	$ (3,977)	$ 2,244
Gain on derivative and amortization of debt discount	2,939	2,584	(5,597)
Other non-deductible expenses	24	63	7
Change in valuation allowance	(2,012)	590	3,254
Reduction in deferred tax assets related to U.S. TCJA rate reduction	7,504	0	0
Rate differential - foreign vs. US	(2,276)	822	114
State income taxes, net of federal benefit	13	23	13
Federal tax impact of state tax benefit, net	129	154	0
Prior year true-up	(13)	0	0
Exchange gain	(13)	28	0
Total income tax (benefit)/expense	(85)	287	35
Alternative Minimum Tax Carryover
Income Tax Contingency [Line Items]
U.S. TCJA recovery of alternative minimum tax credits	$ (73)	$ 0	$ 0