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ACCOUNTS RECEIVABLE NET
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
ACCOUNTS RECEIVABLE NET
ACCOUNTS RECEIVABLE NET
 
Accounts receivable, net consists of the following:
 
December 31,
 
2015
 
2014
Trade receivables
$
42,307

 
$
53,081

Unbilled revenue
4,869

 
4,036

Other receivables
1,561

 
1,581

 
48,737

 
58,698

Less: Allowance for doubtful accounts
(246
)
 
(464
)
Accounts receivable, net
$
48,491

 
$
58,234


 
Under long-term contract accounting unbilled revenue on long-term contracts arise when the sales or revenues based on performance attainment, though appropriately recognized, cannot be billed yet under terms of the contract as of the balance sheet date.  Accounts receivable expected to be collected after one year are not material.