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STOCK-BASED COMPENSATION (Details Narrative) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 17, 2020 USD ($) Grantees $ / shares | Nov. 10, 2020 USD ($) Grantees $ / shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares shares
2015 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares |  |  | $ 1.54 | $ 2.21 | $ 7.96
Common Stock, Shares Subscribed but Unissued | shares |  |  | 18,000,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  | 10 years |  |
Intrinsic value outstanding options | $ |  |  | $ 0 | $ 1,700,000 |
Intrinsic value exercisable options | $ |  |  | 0 | 700,000 |
Intrinsic value of the options exercised | $ |  |  | 600,000 | $ 0 |
Compensation cost related to non-vested options not recognized | $ |  |  | $ 6,600,000 |  |
Weighted average period total compensation costs related to non-vested options |  |  | 2 years 9 months 18 days |  |
Shares of restricted common stock vested | shares |  |  | 3,600,000 | 1,300,000 |
Compensation cost related to restricted common stock not recognized | $ |  |  | $ 3,600,000 |  |
Weighted average compensation costs related to restricted common stock |  |  | 3 years |  |
Options outstanding | shares |  |  | 7,854,851 | 5,560,739 | 5,795,395
Options exercisable | shares |  |  | 3,134,547 |  |
2015 Equity Incentive Plan [Member] | Eligible Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares |  | $ 1.15 |  |  |
Number of grantees affected | Grantees |  | 79 |  |  |
Incremental compensation cost | $ |  | $ 600,000 |  |  |
2015 Equity Incentive Plan [Member] | Eligible Stock Options [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares |  | $ 1.16 |  |  |
2015 Equity Incentive Plan [Member] | Eligible Stock Options [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares |  | $ 17.30 |  |  |
2015 Equity Incentive Plan [Member] | Eligible Director Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares | $ 1.28 |  |  |  |
Number of grantees affected | Grantees | 4 |  |  |  |
Incremental compensation cost | $ | $ 500,000 |  |  |  |
2015 Equity Incentive Plan [Member] | Eligible Director Stock Options [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares | $ 1.29 |  |  |  |
2015 Equity Incentive Plan [Member] | Eligible Director Stock Options [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares | $ 18.50 |  |  |  |
Two Thousand And Fifteen Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock for future issuance | shares |  |  | 1,388,108 |  |
2005 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share | $ / shares |  |  | $ 1.28 | $ 8.55 | $ 12.94
Intrinsic value outstanding options | $ |  |  | $ 0 | $ 0 |
Options outstanding | shares |  |  | 80,000 | 124,800 | 260,000
Options exercisable | shares |  |  | 80,000 |  |

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