SUBSEQUENT EVENT - CAPITAL RAISE (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2020	May 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Proceeds from common stock					$ 13,530,000	$ 2,628,000
Cash balances			$ 5,480,000		$ 5,480,000	$ 716,000	$ 1,870,000
Subsequent Event
Proceeds from common stock	$ 50,200,000
Cash balances	$ 53,300,000
ATM Offering Agreement | Cantor Fitzgerald & Co
Number of common stock issued			2,100,000		4,100,000
Proceeds from common stock			$ 3,700,000		$ 13,900,000
ATM Offering Agreement | Cantor Fitzgerald & Co | Subsequent Event
Number of common stock issued	7,300,000
Proceeds from common stock	$ 42,000,000
2019 Purchase Agreement | Lincoln Park
Number of common stock issued		3,200,000		623,236
Proceeds from common stock		$ 7,700,000		$ 593,356
2019 Purchase Agreement | Lincoln Park | Subsequent Event
Number of common stock issued	1,100,000
Proceeds from common stock	$ 8,200,000