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Taxes (Components of Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Net operating loss and tax credit carryforwards
Net operating loss and tax credit carryforwards	$ 42,012	$ 35,772
Depreciation, amortization and impairment of property and equipment	39	104
Stock options		1,481
Right of use asset	(183)	(163)
Lease liability	195	176
Deferred tax assets	42,063	37,370
Valuation allowance for deferred tax assets	(42,063)	(37,370)
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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