ACCOUNTS RECEIVABLE, NET - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts receivable, net
Accounts receivable, gross	$ 14,805	$ 17,352
Less: Allowance for credit losses	(3,123)	(4,363)	$ (5,297)
Total	11,682	12,989
Billed
Accounts receivable, net
Accounts receivable, gross	9,826	11,993
Unbilled
Accounts receivable, net
Accounts receivable, gross	$ 4,979	$ 5,359