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(1) Summary of Significant Accounting Policies (Details - Options outstanding and exercisable) - shares shares in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |
Number of shares, outstanding | 15,834 | 15,977
Number of shares, exercisable | 12,499 | 12,597
$0.95 - $1.99 [Member] |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |
Number of shares, outstanding | 1,878 | 1,904
Number of shares, exercisable | 1,878 | 1,904
$2.00 - $2.99 [Member] |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |
Number of shares, outstanding | 1,570 | 1,570
Number of shares, exercisable | 180 | 180
$3.00 - $3.99 [Member] |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |
Number of shares, outstanding | 4,863 | 4,973
Number of shares, exercisable | 3,234 | 3,306
$4.00 - $4.99 [Member] |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |
Number of shares, outstanding | 1,533 | 1,540
Number of shares, exercisable | 1,217 | 1,217
$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 | 4,770 | 4,770
Number of shares, exercisable | 4,770 | 4,770
$7.00 - $7.99 [Member] |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |
Number of shares, outstanding | 1,220 | 1,220
Number of shares, exercisable | 1,220 | 1,220

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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