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ACCOUNTS RECEIVABLE, NET (Tables)
 3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following:
(in thousands)
 
March 31,
2019
 
December 31,
2018
 
 
 
 
 
Billed
 
$
27,968

 
$
35,590

Unbilled
 
10,780

 
11,759


 
38,748

 
47,349

Less: Allowance for doubtful accounts
 
(10,114
)
 
(10,883
)
 
 
 
 
 
Total
 
$
28,634

 
$
36,466