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STOCK-BASED COMPENSATION - SUMMARY OF STOCK OPTIONS (Details)
 9 Months Ended
Sep. 30, 2019
$ / shares
shares
Number of options  
Outstanding, beginning of period (in shares) | shares 3,254,779
Granted (in shares) | shares 1,379,500
Exercised (in shares) | shares (391,135)
Canceled and forfeited (in shares) | shares (183,500)
Outstanding, end of period (in shares) | shares 4,059,643
Weighted average exercise price  
Outstanding, beginning of period (in dollars per share) | $ / shares $ 3.18
Granted (in dollars per share) | $ / shares 7.70
Exercised (in dollars per share) | $ / shares 2.84
Canceled and forfeited (in dollars per shares) | $ / shares 3.41
Outstanding, end of period (in dollars per share) | $ / shares $ 4.73