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ACCOUNTS RECEIVABLE, NET (Tables)
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following:
(in thousands)
 
June 30,
2018
 
December 31,
2017
 
 
 
 
 
Billed
 
$
39,313

 
$
40,787

Unbilled
 
17,446

 
22,532

Subtotal
 
56,759

 
63,319

Less: Allowance for doubtful accounts
 
(11,333
)
 
(10,579
)
 
 
 
 
 
Total
 
$
45,426

 
$
52,740