Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares shares in Thousands	Jun. 30, 2023	Dec. 31, 2022
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	8,362	11,167
Number of shares, exercisable	5,675	7,770
Range 1 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,440	1,445
Number of shares, exercisable	1,105	775
Range 2 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	2,543	3,785
Number of shares, exercisable	2,253	3,495
Range 3 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	2,669	2,739
Number of shares, exercisable	1,732	1,802
Range 4 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	0	0
Number of shares, exercisable	0	0
Range 5 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	0	740
Number of shares, exercisable	0	740
Range 6 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	0	748
Number of shares, exercisable	0	748
Range 7 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,710	1,710
Number of shares, exercisable	585	210

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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