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Taxes (Components of Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Net operating loss and tax credit carryforwards
Net operating loss and tax credit carryforwards	$ 35,772	$ 33,835
Depreciation, amortization and impairment of property and equipment	104	109
Stock options	1,481	1,482
Right of use asset	(163)
Lease liability	176
Deferred tax assets	37,370	35,426
Valuation allowance for deferred tax assets	(37,370)	(35,426)
Net deferred tax assets

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Deferred tax assets Lease right of use asset.

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Represents the amount before allocation of valuation allowances of deferred tax assets attributable to deductible temporary differences from depreciation, amortization and estimated impairment losses.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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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.

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