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Supplementary Financial Information to Item 8. (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data
2019
 
Fourth
Quarter
 
Third
Quarter
 
Second
Quarter
 
First
Quarter
Net sales
 
$
3,531

 
$
2,915

 
$
3,082

 
$
3,177

Gross profit
 
957

 
1,028

 
(109
)
 
98

Net loss
 
(1,308
)
 
(946
)
 
(2,254
)
 
(2,865
)
 
 
 
 
 
 
 
 
 
Net loss per share (basic and diluted)
 
$
(0.11
)
 
$
(0.08
)
 
$
(0.18
)
 
$
(0.24
)
 
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
)