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Taxes (Components of Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Net operating loss and tax credit carryforwards
Net operating loss and tax credit carryforwards	$ 53,092	$ 56,593
Depreciation, amortization and impairment of property and equipment	61	34
Stock options	153	67
Right of use asset	(40)	(32)
Lease liability	40	32
Deferred tax assets	53,306	56,694
Valuation allowance for deferred tax assets	(53,306)	(56,694)
Net deferred tax assets	$ 0	$ 0

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Deferred tax assets Lease right of use asset.

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- Definition

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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No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
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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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