Stock-Based Compensation (Details - Future Stock Option Plans) shares in Thousands	Dec. 31, 2022 shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common shares reserved for future issuance (in shares)	3,095
2021 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common shares reserved for future issuance (in shares)	2,403
2015 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common shares reserved for future issuance (in shares)	530
2005 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common shares reserved for future issuance (in shares)	162