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Claims revenue
 12 Months Ended
Dec. 31, 2017
Contractors [Abstract]  
Claims revenue
Claims revenue
Year ended December 31,
 
2017

 
2016

Claims revenue recognized
 
$
1,168

 
$
1,171

The table below represents the classification of uncollected claims on the balance sheet:
 
 
December 31, 2017

 
December 31, 2016

Accounts receivable
 
$
358

 
$
1,171

Unbilled revenue
 
7,662

 
7,088

 
 
$
8,020

 
$
8,259