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ACCOUNTS RECEIVABLE, NET (Tables)
 9 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following:
(in thousands)
 
September 30,
2017
 
December 31,
2016
 
 
 
 
 
Billed
 
$
48,108

 
$
58,392

Unbilled
 
23,951

 
39,853

 
 
72,059

 
98,245

Less: Allowance for doubtful accounts
 
(8,882
)
 
(10,424
)
 
 
 
 
 
Total
 
$
63,177

 
$
87,821