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Receivables
6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Receivables
Receivables

 
June 30, 2018
 
December 31, 2017
Accounts receivable
$
1,396

 
$
894

Less: allowance for doubtful accounts
(75
)
 
(71
)
Net trade receivables
1,321

 
823

Unbilled receivables
229

 

Miscellaneous receivables
240

 
218

Receivables, net
$
1,790

 
$
1,041