SHAREHOLDERS' EQUITY - Warrants (Details) - $ / shares	Jan. 30, 2017	Jan. 20, 2017	Dec. 30, 2016	Dec. 31, 2017
Warrants
Shares underlying outstanding warrants				7,588,800
Underwriter warrants
Warrants
Shares underlying outstanding warrants				255,600
Warrants exercise price (in dollars per share)				$ 1.25
Investor warrants
Warrants
Shares underlying outstanding warrants				6,666,600
Warrants exercise price (in dollars per share)	$ 3.00	$ 3.00	$ 3.00	$ 3.00
Warrants issued during the period (in shares)	5,371,579	5,371,579	1,294,987
Placement agent warrants
Warrants
Shares underlying outstanding warrants				666,600
Warrants exercise price (in dollars per share)	$ 1.50	$ 1.50	$ 1.50	$ 1.50
Warrants issued during the period (in shares)	537,260	537,260	129,516