STOCKHOLDERS' EQUITY - Stock-based compensation by instrument (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total stock-based compensation expenses	$ 22,468	$ 14,414	$ 44,733	$ 31,355
Stock option
Total stock-based compensation expenses	15,130	12,783	29,997	29,443
Restricted stock units
Total stock-based compensation expenses	7,084	1,099	14,246	1,099
2020 ESPP
Total stock-based compensation expenses	$ 254	$ 532	$ 490	$ 813