INCOME TAXES - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax assets:
Federal and state net operating loss carryovers	$ 20,498	$ 19,448
Capitalized research costs	432	0
Stock-based compensation	253	333
Compensation accruals and other	92	139
Operating leases related to ROU assets	89	130
Deferred revenue	11	0
Depreciation	8	0
Other	1	0
Total deferred income tax assets	21,384	20,050
Valuation allowance for deferred income tax assets	(21,298)	(19,916)
Deferred income tax assets, net of valuation allowance	86	134
Deferred income tax liabilities:
Depreciation	0	(7)
ROU assets	(86)	(127)
Total deferred income tax liabilities	(86)	(134)
Deferred income tax assets, net	$ 0	$ 0

Deferred Tax Assets, Capitalized Research And Development Costs

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Deferred Tax Assets, Leasing Arrangements

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