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Current Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Current receivables
Current receivables are comprised of the following at December 31:
 
2017
2016
Customer receivables
$
4,700

$
1,700

Related parties
801

392

Other
844

658

Total current receivables
6,345

2,750

Less: Allowance for doubtful accounts
(330
)
(186
)
Total current receivables, net
$
6,015

$
2,564