STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details) - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
STOCK-BASED COMPENSATION
Number of stock options outstanding, Beginning of period	18,546	5,723
Number of stock options outstanding, Granted	20,942	16,254
Number of stock options outstanding, Expired	(1,040)	(1,608)
Number of stock options outstanding, Canceled or forfeited	(550)
Number of stock options outstanding, End of period	37,898	20,369
Number of stock options Exercisable, End of period	37,898	20,369
Weighted average exercise price, Beginning of period	$ 64.49	$ 276.50
Weighted average exercise price, Granted	19.25	49.00
Weighted average exercise price, Expired	78.00	262.00
Weighted average exercise price, Canceled or forfeited	19.25
Weighted average exercise price, End of period	39.78	95.50
Weighted average exercise price Exercisable, End of period	$ 39.78	$ 95.50