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Income Taxes (Details - Deferred Tax Assets and Liabilities) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 15,998 | $ 15,994
Net operating loss carryforwards of foreign subsidiaries | 56 | 56
Depreciation expense | (182) | (73)
Stock-based compensation expense | 528 | 349
Other | 546 | 830
Net deferred tax assets | 16,946 | 17,156
Valuation allowance for net deferred tax assets | (16,946) | (17,156)
Net deferred tax assets, net of valuation 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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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