STOCKHOLDERS' EQUITY - Stock-based compensation by instrument (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total stock-based compensation expenses	$ 19,780	$ 19,306	$ 64,513	$ 50,661
Stock option
Total stock-based compensation expenses	14,270	13,339	44,267	42,782
Restricted stock units
Total stock-based compensation expenses	5,100	5,788	19,346	6,887
2020 ESPP
Total stock-based compensation expenses	$ 410	$ 179	$ 900	$ 992