STOCKHOLDERS' EQUITY (Details) - USD ($)		3 Months Ended	9 Months Ended
	Feb. 13, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Common Stock [Abstract]
Number of stock options exercised (in shares)			46,875	114,947
Common stock exercised on cashless basis (in shares)			24,075	71,290
Underwritten public offering (in shares)	1,783,760
Public offering price per share (in dollars per share)	$ 6.75		$ 5.40
Gross proceeds from public offering	$ 12,000,000	$ 10,934,352
Net proceeds after underwriting discounts and other offering expenses	$ 10,900,000		$ 0	$ 10,934,352