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Taxes (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Taxes
US corporate income tax rate	34.00%	34.00%
Corporate income tax rate	21.00%
Valuation allowance for deferred tax assets	$ 44,887	$ 49,374
Reduction in deferred tax assets	$ 4,100
Use of these NOLs restricted to an annual allowance	use of these NOLs is restricted to an annual £5 million allowance in each standalone company or group and above this allowance, there will be a 50% restriction in the profits that can be covered by losses brought forward
Maximum
Taxes
US corporate income tax rate	35.00%
Federal
Taxes
NOLs carryforward	$ 28,400	28,400
United Kingdom
Taxes
Income tax credits	4,000
NOLs carryforward	$ 186,200	178,200
Percentage of tax rate adopted in respect of deferred tax assets measurement	17.00%
Research and development | United Kingdom
Taxes
Income tax credits	$ 1,000	$ 2,000

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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