NATURE OF OPERATIONS (Details)			12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 15, 2022 USD ($)	Dec. 31, 2022 USD ($) segment $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Jul. 19, 2021 $ / shares shares	Jul. 18, 2021 shares	Feb. 12, 2021 shares	Feb. 11, 2021 shares
Subsequent Event [Line Items]
Number of reportable segments | segment			1
Common stock, shares authorized (in shares) | shares			150,000,000	75,000,000	150,000,000	75,000,000	75,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.0001	$ 0.0001	$ 0.0001
Net loss			$ (23,210,000)	$ (73,329,000)
Cash used in operations			(29,200,000)	(56,367,000)
Income (loss) from discontinued operations, net of income taxes			10,735,000	(29,121,000)
Loss from continuing operations			(33,945,000)	(44,208,000)
Cash and investments			31,000,000
Accumulated deficit			662,735,000	639,525,000
Additional paid-in capital			693,937,000	688,156,000
Debt outstanding			0
Lincoln Park Equity Purchase Agreement
Subsequent Event [Line Items]
Consideration receivable on transaction	$ 30,000,000	$ 30,000,000
Term of equity purchase agreement	36 months	36 months
Sale of stock, public float threshold			75,000,000
Discontinued Operations, Disposed of by Sale | MST Franchise
Subsequent Event [Line Items]
Income (loss) from discontinued operations, net of income taxes			10,735,000	$ (29,121,000)
Additional paid-in capital			$ 5,000,000
Menlo - Premerger
Subsequent Event [Line Items]
Common stock, shares authorized (in shares) | shares								300,000,000