(1) Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares shares in Thousands	Mar. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	12,028	13,074
Number of shares, exercisable	8,068	9,685
$0.95 - $1.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	34	577
Number of shares, exercisable	34	577
$2.00 - $2.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,517	1,517
Number of shares, exercisable	489	489
$3.00 - $3.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	4,172	4,285
Number of shares, exercisable	3,270	3,382
$4.00 - $4.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	2,847	2,870
Number of shares, exercisable	1,567	1,410
$5.00 - $5.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	0	0
Number of shares, exercisable	0	0
$6.00 - $6.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,933	2,651
Number of shares, exercisable	1,933	2,652
$7.00 - $7.99 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	775	1,175
Number of shares, exercisable	775	1,175
Range 8 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	750	0
Number of shares, exercisable	0	0

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ 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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