STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details) - USD ($)		12 Months Ended
	Mar. 26, 2020	Dec. 31, 2022	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
Proceeds from exercise of warrants		$ 11,000	$ 400,000
Proceeds upon issuance of common stock from exercise of stock options			3,000
Issuance of common stock in connection with at the market offering, net of issuance costs		$ 129,000	$ 14,947,000
Shares issued (in shares)		22,820,260	22,708,442
Common stock, shares outstanding (in shares)		22,820,260	22,708,442
Issuance of common stock, net of issuance costs		$ 129,000	$ 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)		26,795	74,000
Proceeds upon issuance of common stock from exercise of stock options (in shares)			1,379
Issuance of common stock in connection with at the market offering, net of issuance costs		$ 1,000	$ 45,000
Shares issued (in shares)		85,023	4,501,000
Issuance of common stock for consulting services (in shares)			55,147
Common Stock [Member]
Class of Stock [Line Items]
Common stock issued for exercise of warrants		26,795	74,000
Warrant exercises in period		26,795
Proceeds from exercise of warrants			$ 400,000
Proceeds upon issuance of common stock from exercise of stock options			$ 3,000
Proceeds upon issuance of common stock from exercise of stock options (in shares)			1,379
Issuance of common stock for consulting services (in shares)			55,147
Issuance of common stock for consulting services			$ 200,000
Preferred Class B
Class of Stock [Line Items]
Conversion price (in dollars per share)		$ 0.40
Lincoln Park [Member]
Class of Stock [Line Items]
Shares issued (in shares)			500,000
Issuance of common stock, net of issuance costs			$ 1,300,000
Maximum [Member] | Common Stock [Member]
Class of Stock [Line Items]
Proceeds from exercise of warrants		$ 100,000
Per Proposal To Increase Authorized Shares [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)				250,000,000
LP 2020 Purchase Agreement [Member]
Class of Stock [Line Items]
Purchase agreement term		24 months
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