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