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Supplementary Financial Information to Item 8. (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data
2018
 
Fourth
Quarter
 
Third
Quarter
 
Second
Quarter
 
First
Quarter
Net sales
 
$
3,118

 
$
5,158

 
$
5,172

 
$
4,659

Gross profit
 
19

 
1,281

 
1,296

 
816

Net loss
 
(3,000
)
 
(1,920
)
 
(1,801
)
 
(2,390
)
 
 
 
 
 
 
 
 
 
Net loss per share (basic and diluted)
 
$
(0.25
)
 
$
(0.16
)
 
$
(0.15
)
 
$
(0.20
)
 
2017
 
Fourth
Quarter
 
Third
Quarter
 
Second
Quarter
 
First
Quarter
Net sales
 
$
4,727

 
$
5,002

 
$
6,011

 
$
4,106

Gross profit
 
1,622

 
1,137

 
1,501

 
561

Net loss
 
(1,858
)
 
(1,773
)
 
(3,114
)
 
(4,522
)
 
 
 
 
 
 
 
 
 
Net loss per share (basic and diluted)
 
$
(0.16
)
 
$
(0.15
)
 
$
(0.26
)
 
$
(0.39
)