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ACCOUNTS RECEIVABLE, NET (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following as of December 31:
(in thousands)
 
2018
 
2017
 
 
 
 
 
Billed
 
$
35,590

 
$
40,787

Unbilled
 
11,759

 
22,532

 
 
47,349

 
63,319

Less: Allowance for doubtful accounts
 
(10,883
)
 
(10,579
)
 
 
 
 
 
Total
 
$
36,466

 
$
52,740