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NATURE OF BUSINESS AND BASIS OF PRESENTATION - Liquidity (Details) - USD ($) $ in Thousands		3 Months Ended
	Aug. 02, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Aug. 31, 2023	Jul. 08, 2022
Acquisition of Combangio, Inc
Common stock, shares issued		2,816,454		2,759,372
Common stock, shares outstanding		2,816,454		2,759,372
Common stock, authorized		120,000,000		120,000,000
Net loss		$ (11,807)	$ (14,455)
Cash used in operations		(10,844)	$ (9,684)
Accumulated deficit		$ 641,216		$ 629,409
Award agreement | California Institute for Regenerative Medicine (CIRM)
Acquisition of Combangio, Inc
Amount that may not be received if specific milestones are not met					$ 9,100
Combangio, Inc. | Award agreement | California Institute for Regenerative Medicine (CIRM)
Acquisition of Combangio, Inc
Restricted grant	$ 15,000
Grant disbursement	$ 5,900
Commercial Business Sale to Alcon | Disposed of by sale not discontinued operations
Acquisition of Combangio, Inc
Amount receivable upon the achievement of specified commercial sales-based milestones						$ 325,000

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