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SHAREHOLDERS' EQUITY - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Apr. 16, 2021
STOCK BASED COMPENSATION      
Stock options granted (in shares) 5,716,150 4,963,516  
Number of common stock reserved for issuance 30,000,000.0   12,500,000
Maximum number of shares that may be subject to grants of options to an individual in a calendar year 500,000    
Shares      
Granted (in shares) 5,716,150 4,963,516  
Shares of common stock issued upon exercise of stock options 0 60,000  
Weighted Average Exercise Price      
Weighted average exercise price of stock options (in dollars per share)   $ 1.06  
Proceeds from exercise of stock options   $ 61  
Granted (in shares) 5,716,150 4,963,516  
Common Stock and Additional Paid-in Capital      
Shares      
Shares of common stock issued upon exercise of stock options   60,000