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Income Taxes (Details - Deferred Tax Assets and Liabilities) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 15,994 | $ 22,497
Net operating loss carryforwards of foreign subsidiaries | 56 | 56
Depreciation expense | (73) | (94)
Stock-based compensation expense | 349 | 52
Other | 830 | 544
Net deferred tax assets | 17,156 | 23,055
Valuation allowance for net deferred tax assets | (17,156) | (23,055)
Net deferred tax assets, net of allowance | $ 0 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 + Details
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