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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Sep. 05, 2019
Preferred stock, shares authorized | 10,000,000 |  | 10,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ 0.001 |  | $ 0.001 |  |  |
Warrant purchase price | $ 4.08 |  | $ 4.08 |  |  |
Warrants issued | 147,058 |  | 147,058 |  |  |
Common Stock, Shares Authorized | 175,000,000 |  | 175,000,000 |  | 175,000,000 |
Common stock, par value (in dollars per share) | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Stock-based compensation expense | $ 14,000 | $ 28,300 | $ 46,918 | $ 46,768 |  |
Warrants [Member] |  |  |  |  |  |
Warrant purchase price | $ 4.08 |  | $ 4.08 |  |  |
Warrants issued | 147,058 |  | 147,058 |  |  |
2020 ATM [Member] |  |  |  |  |  |
Percent of commission rate |  |  |  |  |  | 3.00%
Amended and Restated 2012 Incentive Plan [Member] |  |  |  |  |  |
Number of additional shares that may be issued | 1,746,700 |  | 1,746,700 |  |  |
Amended and Restated 2012 Incentive Plan [Member] | Unvested restricted stock |  |  |  |  |  |
Restricted stock outstanding | 11,992,744 |  | 11,992,744 |  |  |
Amended and Restated 2012 Incentive Plan [Member] | Stock options |  |  |  |  |  |
Restricted stock outstanding | 2,467,537 |  | 2,467,537 |  |  |

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