INCOME TAXES - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax assets:
Federal and state net operating loss carryovers	$ 22,167	$ 20,498
Capitalized research costs	608	432
Stock-based compensation	260	253
Compensation accruals and other	59	92
Operating leases related to ROU assets	54	89
Deferred revenue	4	11
Depreciation	11	8
Other	2	1
Total deferred income tax assets	23,165	21,384
Valuation allowance for deferred income tax assets	(23,113)	(21,298)
Deferred income tax assets, net of valuation allowance	52	86
Deferred income tax liabilities:
ROU assets	(52)	(86)
Total deferred income tax liabilities	(52)	(86)
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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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-6

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from compensation and benefits, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements.

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