WARRANTS - Warrant Share Activity (Details) - Common stock warrants	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Roll forward of warrant activity
Balance at the beginning of the period (in warrants)	2,134,362
Warrants exercised/expired (in warrants)	0
Balance at the end of the period (in warrants)	2,134,362
Consulting Warrants
Warrant liabilities
Exercise price (in dollars per share) | $ / shares	$ 0.01
Roll forward of warrant activity
Balance at the beginning of the period (in warrants)	6,667
Warrants exercised/expired (in warrants)	0
Balance at the end of the period (in warrants)	6,667
Financing Warrants
Warrant liabilities
Exercise price (in dollars per share) | $ / shares	$ 3.35
Roll forward of warrant activity
Balance at the beginning of the period (in warrants)	62,530
Warrants exercised/expired (in warrants)	0
Balance at the end of the period (in warrants)	62,530
Private Placement Warrants - September 2017
Warrant liabilities
Exercise price (in dollars per share) | $ / shares	$ 4.85
Roll forward of warrant activity
Balance at the beginning of the period (in warrants)	1,966,319
Warrants exercised/expired (in warrants)	0
Balance at the end of the period (in warrants)	1,966,319
Placement Agent Warrants
Warrant liabilities
Exercise price (in dollars per share) | $ / shares	$ 4.85
Roll forward of warrant activity
Balance at the beginning of the period (in warrants)	98,846
Warrants exercised/expired (in warrants)	0
Balance at the end of the period (in warrants)	98,846