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ACCOUNTS RECEIVABLE, NET (Tables)
 3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following:
(in thousands)
 
March 31,
2018
 
December 31,
2017
 
 
 
 
 
Billed
 
$
42,509

 
$
40,787

Unbilled
 
19,231

 
22,532

 
 
61,740

 
63,319

Less: Allowance for doubtful accounts
 
(10,901
)
 
(10,579
)
 
 
 
 
 
Total
 
$
50,839

 
$
52,740