STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details) - USD ($)		3 Months Ended		6 Months Ended
	Mar. 26, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 20, 2018	Dec. 19, 2018
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		150,000,000		150,000,000		150,000,000	250,000,000	150,000,000
Issuance of common stock in connection with at the market offering, net of issuance costs			$ 14,947,000		$ 14,947,000
Shares issued (in shares)		22,708,708		22,708,708		22,708,442
Common stock, shares outstanding (in shares)		22,708,708		22,708,708		22,708,442
Issuance of common stock, net of issuance costs					16,207,000
Issuance of common stock for consulting services					$ 150,000
Common Stock [Member]
Class of Stock [Line Items]
Proceeds upon issuance of common stock from exercise of warrants (in shares)			74,000	266	74,000
Warrant exercises in period				266
Issuance of common stock in connection with at the market offering, net of issuance costs			$ 45,000		$ 45,000
Shares issued (in shares)			4,501,000		4,501,000
Issuance of common stock for consulting services (in shares)					55,147
Issuance of common stock for consulting services					$ 200,000
Common Stock [Member]
Class of Stock [Line Items]
Proceeds upon issuance of common stock from exercise of warrants (in shares)		0	74,000	266	74,000
Warrant exercises in period		0	74,000
Proceeds from exercise of warrants			$ 400,000		$ 200,000
Preferred Class B
Class of Stock [Line Items]
Conversion price (in dollars per share)		$ 0.40		$ 0.40
Lincoln Park [Member]
Class of Stock [Line Items]
Shares sold in offering (in shares)			0		500,000
Issuance of common stock, net of issuance costs			$ 0		$ 1,300,000
Maximum [Member] | Common Stock [Member]
Class of Stock [Line Items]
Proceeds from exercise of warrants				$ 1,000
LP 2020 Purchase Agreement [Member] | Lincoln Park [Member]
Class of Stock [Line Items]
Issuance of common stock in connection with at the market offering, net of issuance costs	$ 10,000,000