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ACCOUNTS RECEIVABLE, NET (Tables)
 6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following:
(in thousands)
 
June 30,
2019
 
December 31,
2018
 
 
 
 
 
Billed
 
$
39,130

 
$
35,590

Unbilled
 
14,382

 
11,759


 
53,512

 
47,349

Less: Allowance for doubtful accounts
 
(9,265
)
 
(10,883
)
 
 
 
 
 
Total
 
$
44,247

 
$
36,466