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COMMON STOCK (Details)
 3 Months Ended
Mar. 31, 2021
Vote
$ / shares
shares
Mar. 31, 2020
shares
Dec. 31, 2020
$ / shares
shares
Common Class A [Member]      
Class of Stock [Abstract]      
Common stock, shares authorized (in shares) 50,000,000   50,000,000
Common stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001
Number of votes for each share entitled | Vote 1    
Common stock, shares issued (in shares) 17,239,967   16,896,693
Common stock, shares outstanding (in shares) 17,239,967   16,896,693
Common Class B [Member]      
Class of Stock [Abstract]      
Common stock, shares authorized (in shares) 2,409,738   2,409,738
Common stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001
Number of votes for each share entitled | Vote 20    
Convertible shares in to Class A common stock (in shares) 1    
Common stock, shares issued (in shares) 1,769,272   1,802,606
Common stock, shares outstanding (in shares) 1,769,272   1,802,606
Common Stock [Member] | Common Class A [Member]      
Class of Stock [Abstract]      
Stock issued upon exercise of stock options (in shares) 309,940 70,478  
Conversion of class B common stock to Class A common stock (in shares) 33,334    
Exercise of common stock warrant issued (in shares)   64,717  
Common Stock [Member] | Common Class B [Member]      
Class of Stock [Abstract]      
Stock issued upon exercise of stock options (in shares) 0 0  
Conversion of class B common stock to Class A common stock (in shares) (33,334)    
Exercise of common stock warrant issued (in shares)   0