ACCRUED LIABILITIES AND OTHER - Components of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Oct. 31, 2020
Payables and Accruals [Abstract]
Accrued outsourced clinical trials and preclinical studies	$ 8,922	$ 12,576
Accrued employee compensation and related taxes	7,645	4,772
Operating lease liability, short-term	821	613	$ 100
Accrued legal fees and expenses	272	177
Accrued other professional service fees	397	392
Value of liability-classified stock purchase warrants	100	100
Accrued interest payable	149	39
Other accrued liabilities	918	158
Total accrued liabilities	$ 19,224	$ 18,827
Operating lease, liability, current, statement of financial position [Extensible List]	Total accrued liabilities	Total accrued liabilities