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SCHEDULE OF STOCK BASED COMPENSATION (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | $ 5,853,000 | $ 7,338,000
Tax benefit |  |
Stock based compensation expense, net of tax | 5,853,000 | 7,338,000
Share-based Payment Arrangement, Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | 5,853,000 | 7,338,000
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 | 3,126,000 | 3,932,000
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 | 2,727,000 | 3,406,000
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | 2,334,000 | 899,000
Tax benefit |  |
Stock based compensation expense, net of tax | 2,334,000 | 899,000
Restricted stock-based compensation expense included in operating expense | 2,334,000 | 899,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | 957,000 | 454,000
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 | $ 1,377,000 | $ 445,000

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