INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 22	$ (145)	$ 31	$ (245)
Effective tax rate	(0.00%)	(0.00%)	(0.00%)	(0.00%)
Unrecognized tax benefits	$ 65,600		$ 65,600		$ 42,900
Unrecognized tax benefits that would impact effective tax rate	$ 2,600		$ 2,600		$ 2,600