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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