STOCKHOLDERS' EQUITY - Outstanding Warrants (Details) - USD ($)	1 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Number of warrants
Number of shares, exercised	(1,212,136)
Warrant
Number of warrants
Number of shares, Beginning		1,781,715
Number of shares, granted		146,667
Number of shares, exercised		(1,279,550)
Number of shares, Forfeited		(111,511)
Number of shares, Ending		537,321	1,781,715
Wtd Avg. Exercise Price
Outstanding (in dollars per share)		$ 4.20
Granted (in dollars per share)		6.00
Exercised (in dollars per share)		1.85
Forfeited (in dollars per share)		10.72
Outstanding (in dollars per share)		$ 7.34	$ 4.20
Wtd Avg. Remaining Term
Outstanding		10 months 24 days	2 years 2 months 23 days
Granted		1 year
Intrinsic Value of Warrants
Outstanding		$ 8,930,058
Outstanding		$ 63,500	$ 8,930,058