SUBSEQUENT EVENTS (Details) - USD ($)					1 Months Ended	9 Months Ended	12 Months Ended
	Oct. 11, 2018	Oct. 05, 2018	Oct. 01, 2018	Jul. 25, 2017	Nov. 08, 2018	Sep. 30, 2018	Dec. 31, 2017
Subsequent Events
Shares Exercisable						113,328	113,328
Underwriter's option
Subsequent Events
Issuance of common stock upon IPO, net of underwriters discount and offering costs (in shares)				900,000
Subsequent Event | Athyrium
Subsequent Events
Debt term			6 years
Interest rate			9.875%
Prepayment fees paid			$ 180,000
Shares warrants may purchase			270,835
Exercise Price			$ 12.18456
Shares Exercisable			184,660
Shares Exercisable upon condition			86,175
Credit facility term			7 years
Subsequent Event | Underwriter's option
Subsequent Events
Issuance of common stock upon IPO, net of underwriters discount and offering costs (in shares)		1,125,000
Subsequent Event | Shelf
Subsequent Events
Issuance of common stock upon IPO, net of underwriters discount and offering costs (in shares)	8,625,000	7,500,000
Share Price		$ 8.25
Net proceeds	$ 66,400,000
Subsequent Event | ATM
Subsequent Events
Issuance of common stock upon IPO, net of underwriters discount and offering costs (in shares)					518,135
Net proceeds					$ 4,700,000
Term Loan A | Subsequent Event | Athyrium
Subsequent Events
Aggregate principal amount			$ 75,000,000
Term Loan B | Subsequent Event | Athyrium
Subsequent Events
Aggregate principal amount			$ 35,000,000