NATURE OF OPERATIONS (Details)					12 Months Ended
	Nov. 01, 2023 USD ($)	Oct. 27, 2023 $ / shares shares	Feb. 10, 2023	Mar. 15, 2022 shares	Dec. 31, 2023 USD ($) segment $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of reportable segments | segment					1
Reverse stock split ratio			0.0555
Outstanding warrants to purchase common stock (in shares) | shares					27,509	27,509
Warrant exercise price (in dollars per share) | $ / shares					$ 8.40	$ 76.78
Cash, cash equivalents and restricted cash					$ 93,300,000
Accumulated deficit					691,336,000	$ 662,735,000
Net income (Loss)					(28,452,000)	(23,210,000)
Net cash used in operating activities					25,341,000	29,200,000
Loss from continuing operations					27,872,000	33,945,000
(Loss) income from discontinued operations, net of income taxes					(580,000)	$ 10,735,000
Debt outstanding					0
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					5,486,000
Net proceeds from private placement					82,665,000
Lincoln Park Equity Purchase Agreement
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares issued in transaction (in shares) | shares				92,644
Sale of stock, public float threshold					$ 75,000,000
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
Warrant exercise price (in dollars per share) | $ / shares		$ 0.0001