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SCHEDULE OF STOCK BASED COMPENSATION (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense |  |  | $ 3,797,000 | $ 4,083,000
Share-based Payment Arrangement, Option [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 432,000 | $ 765,000 | 1,649,000 | 2,380,000
Share-based Payment Arrangement, Option [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 955,000 | 484,000 | 2,148,000 | 1,703,000
Share-based Payment Arrangement, Option [Member] | Stock Option-Based Compensation Expense Included in Operating Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 1,387,000 | 1,249,000 | 3,797,000 | 4,083,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 256,000 | 89,000 | 1,286,000 | 561,000
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 894,000 | 72,000 | 1,832,000 | 251,000
Restricted Stock [Member] | Stock Option-Based Compensation Expense Included in Operating Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 1,150,000 | $ 161,000 | $ 3,118,000 | $ 812,000

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