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Income Taxes, Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income taxed at statutory rates	$ (4,212)	$ (1,226)	$ 392
Stock-based compensation	46	(382)	32
Other adjustments	(87)	15	27
Adjustments due to capital transactions			(119)
R&D grant		5,936	5,366
Prior year provision to actual adjustments	108	(4,269)	(2,894)
Change in US tax rate	2,487
Differences in tax rates	563	524	(368)
Effect of foreign exchange	(99)	379	350
Expiration of NOLs			231
Change in valuation allowance	$ 1,194	$ (977)	$ (3,017)

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