NATURE OF OPERATIONS (Details)				3 Months Ended
	Nov. 01, 2023 USD ($)	Oct. 27, 2023 $ / shares shares	Feb. 10, 2023	Mar. 31, 2024 USD ($) segment shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of reportable segments | segment				1
Reverse stock split ratio			0.0556
Outstanding warrants to purchase common stock (in shares) | shares				27,509
Cash and investments				$ 86,000,000
Accumulated Deficit				697,585,000		$ 691,336,000
Debt outstanding				0
Net loss				6,249,000	$ 5,622,000
Cash used in operations				7,982,000	$ 5,478,000
Private Placement
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares issued in transaction (in shares) | shares		10,652,543
Price per share (in dollars per share) | $ / shares		$ 2.245
Consideration received in a transaction	$ 88,200,000
Payments of stock issuance costs	5,500,000
Net proceeds from private placement	$ 82,700,000
Pre-Funded Warrants
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Outstanding warrants to purchase common stock (in shares) | shares		28,614,437
Lincoln Park Equity Purchase Agreement
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Sale of stock, public float threshold				$ 75,000,000