SUBSEQUENT EVENTS - Narrative (Details) - USD ($)	Feb. 17, 2020	Dec. 31, 2019	Aug. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Common stock, shares issued (in shares)		8,480,968	7,810,680	589,001
Private Placement Offerings | Subsequent Event
Subsequent Event [Line Items]
Common stock, shares issued (in shares)	950,000
Aggregate gross purchase price	$ 2,000,000.0
Lincoln Park | Subsequent Event
Subsequent Event [Line Items]
Purchase obligation	28,000,000.0
Maximum commitment purchase amount	$ 1,000,000
Percentage of ownership after transaction	9.99%
Lincoln Park | Purchase Agreement | Subsequent Event
Subsequent Event [Line Items]
Maximum shares allowed to be purchased	100,000
Maximum share increase amount	125,000
Closing sale price (in dollars per share)	$ 3.00
Lincoln Park | Regular Purchase | Subsequent Event
Subsequent Event [Line Items]
Maximum share increase amount	150,000
Closing sale price (in dollars per share)	$ 5.00
Bodor Laboratories, Inc. | Subsequent Event
Subsequent Event [Line Items]
Non-refundable upfront fees	$ 1,000,000.0
Series A | Private Placement Offerings | Subsequent Event
Subsequent Event [Line Items]
Stock issuable upon warrants (in shares)	606,420
Exercise price (in usd per share)	$ 0.01
Series B | Private Placement Offerings | Subsequent Event
Subsequent Event [Line Items]
Stock issuable upon warrants (in shares)	1,556,420
Exercise price (in usd per share)	$ 1.16