ACCOUNTS RECEIVABLE, NET (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable, net
Accounts receivable, gross	$ 40,650	$ 48,087
Less: Allowance for credit losses	(5,313)	(4,472)
Total	35,337	43,615
Billed
Accounts receivable, net
Accounts receivable, gross	30,850	35,921
Unbilled
Accounts receivable, net
Accounts receivable, gross	$ 9,800	$ 12,166

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