SEGMENT REPORTING - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment reporting
Revenue recognition	$ 73,855	$ 48,625	$ 138,332	$ 103,146
Property and equipment, net	43,771		43,771		$ 52,671
Assets held-for-sale	8,020		8,020
United States
Segment reporting
Revenue recognition	72,811	47,580	136,571	100,907
Property and equipment, net	38,964		38,964		38,564
Canada
Segment reporting
Revenue recognition	1,044	$ 1,045	1,761	$ 2,239
Property and equipment, net	4,552		4,552		13,831
Assets held-for-sale	8,000		8,000
India
Segment reporting
Property and equipment, net	$ 255		$ 255		$ 276