INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax (benefit) at the federal statutory rate of 21%	$ (5,924)	$ (19,857)	$ (19,722)
State income taxes, net of effect of federal tax benefit	1,510	362	(1,040)
Research credit	(4,912)	(7,123)	(2,431)
Stock-based compensation	4,546	3,917	(13,643)
Non-deductible executive compensation	3,514	4,731	3,312
Unbenefited losses	3,352	7,106	1,610
Net adjustment related to the reconciliation of income tax provision accruals to tax returns	(2,430)	(1,212)	335
Foreign income taxed at a different statutory tax rate	1,216	5,355	2,872
Change in judgement on beginning of the year valuation allowance	399	966	(4,165)
Deferred tax adjustment for enacted changes in tax law and rates	99	178	768
Other, net	469	187	2,210
Income tax provision (benefit)	$ 1,839	$ (5,390)	$ (29,894)