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