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Receivables (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of accounts receivable
 
 
As of December 31
 
 
2018
 
2017
Receivables
 
$
378

 
$
450

Allowance at beginning of year
 
$
(2
)
 
$
(4
)
Reversal of allowance
 
—

 
2

Allowance at end of year
 
$
(2
)
 
$
(2
)
Total receivables, net of allowance
 
$
376

 
$
448