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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Stock Option, Warrants, and RSUs Activity (Details)
3 Months Ended
Mar. 31, 2021
shares
Stock Options  
Number of Options  
Balance at beginning of the period (in shares) 516,911
Exercised (137,702)
Forfeited/Expired (43,589)
Balance at end of the period (in shares) 335,620
Vested (in shares) 161,575
Unvested (in shares) 174,045
Number of warrants  
Exercised (174,045)
Warrant  
Number of warrants  
Balance at beginning of the period (In shares) 81,053
Exercised (16,800)
Balance at end of the period (In shares) 64,253
Vested (in shares) 64,253
Unvested restricted stock units as of March 31, 2021 64,253
Restricted Stock Units  
Number of Options  
Unvested (in shares) 91,945
Number of warrants  
Balance at end of the period (In shares) 729,016
Restricted stock units outstanding 958,378
Granted 157,630
Exercised (91,945)
Forfeited/Expired (29,350)
Total Restricted stock units outstanding 994,713
Vested restricted stock units as of March 31, 2021 265,697
Unvested restricted stock units as of March 31, 2021 729,016