ACCOUNTS RECEIVABLE, NET - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable, net
Accounts receivable, gross	$ 17,352	$ 23,305
Less: Allowance for credit losses	(4,363)	(5,297)	$ (5,581)
Total	12,989	18,008
Billed
Accounts receivable, net
Accounts receivable, gross	11,993	17,907
Unbilled
Accounts receivable, net
Accounts receivable, gross	$ 5,359	$ 5,398