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ACCOUNTS RECEIVABLE, NET (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following as of December 31:
(in thousands)
 
2019
 
2018
 
 
 
 
 
Billed
 
$
35,921

 
$
35,590

Unbilled
 
12,166

 
11,759

 
 
48,087

 
47,349

Less: Allowance for doubtful accounts
 
(4,472
)
 
(10,883
)
 
 
 
 
 
Total
 
$
43,615

 
$
36,466