INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 14,566	$ 31,069
Tax credit carryforwards	13,509	12,138
Accrued bonus	3,745	2,449
Stock-based compensation	10,767	10,209
Capitalized research and development expenses	26,977	14,242
Other	4,569	7,509
Total deferred tax assets	74,133	77,616
Less: valuation allowance	(62,108)	(67,544)
Net deferred tax assets	12,025	10,072
Deferred tax liabilities:
Prepaid expenses	(5,468)	(4,834)
Intangible assets with definite lives	(3,308)	(925)
Right-of-use assets	(3,303)	(3,755)
Withholding taxes	(1,083)	(905)
Other	(56)	(106)
Total deferred tax liabilities	(13,218)	(10,525)
Net deferred tax liabilities	$ (1,193)	$ (453)