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INCOME TAX - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 72,508 | $ 72,903
Tax credit carryforwards | 6,851 | 7,794
Section 174 expenses | 7,775 | 3,529
Share-based compensation | 1,988 | 2,061
Accrued expenses and other | 651 | 586
Total gross deferred tax assets | 89,773 | 86,873
Less - valuation allowance | (89,773) | (86,873)
Total deferred tax assets, net of valuation allowance | 0 | 0
Deferred tax liabilities: |  |
Other | 0 | 0
Right of use assets | 0 | 0
Total gross deferred tax liabilities | 0 | 0
Net deferred tax assets | $ 0 | $ 0

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