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Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax credit at statutory rates	$ (437)	$ (268)
Nondeductible expenses	4	2
State income tax, net of federal benefits	(156)	(45)
Expiration of NOL	1,559
Effect of US tax rate change		9,284
Expiration of stock options	180	188
Change in valuation allowance	(1,148)	(9,161)
Total	$ 0	$ 0

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