EQUITY INCENTIVE PLANS - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	$ 852	$ 871	$ 2,190	$ 1,750
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	468	399	923	790
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	$ 384	$ 472	$ 1,267	$ 960