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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cash, cash equivalents, receivables and short-term investments | $ 103,900,000 |  | $ 103,900,000 |  |
Net assets | $ 115,100,000 |  | 115,100,000 |  |
Net cash used in operating activities |  |  | $ 33,409,000 | $ 48,574,000 |
Common stock, shares outstanding | 84,516,161 |  | 84,516,161 |  | 83,622,135
Anti dilutive computation of basic net loss per share | 6,431,183 | 8,518,666 | 6,431,183 | 8,518,666 |
Pre Funded Warrant [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Anti dilutive computation of basic net loss per share | 9,017,055 |  | 9,017,055 |  |

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