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EQUITY INCENTIVE PLAN (Summary of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Number of Options    
Outstanding at beginning of period (in shares) 822,992  
Granted (in shares) 1,907,347 393,050
Exercised (in shares) (1,229)  
Forfeited (in shares) (81,594) (75,135)
Outstanding at end of period (in shares) 2,647,516  
Exercisable at end of period (in shares) 633,027  
Weighted-Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 4.46  
Granted (in dollars per share) 2.89 $ 1.99
Exercised (in dollars per share) 2.04  
Forfeited (in dollars per share) 2.83 $ 13.86
Outstanding at end of period (in dollars per share) 3.38  
Exercisable at end of period (in dollars per share) $ 4.91