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