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Claims revenue (Tables)
 12 Months Ended
Dec. 31, 2016
Contractors [Abstract]  
Schedule of claims revenue
Year ended December 31,
 
2016

 
2015

Claims revenue recognized
 
$
1,171

 
$
7,547

The table below represents the classification of uncollected claims on the balance sheet:
 
 
December 31, 2016

 
December 31, 2015

Accounts receivable
 
$
1,171

 
$
—

Unbilled revenue
 
7,088

 
7,547

 
 
$
8,259

 
$
7,547