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Supplementary Financial Information to Item 8. (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 3,118 $ 5,158 $ 5,172 $ 4,659 $ 4,727 $ 5,002 $ 6,011 $ 4,106 $ 18,107 $ 19,846 $ 30,998
Gross profit 19 1,281 1,296 816 1,622 1,137 1,501 561 3,412 4,821 7,677
Net loss $ (3,000) $ (1,920) $ (1,801) $ (2,390) $ (1,858) $ (1,773) $ (3,114) $ (4,522) $ (9,111) $ (11,267) $ (16,887)
Net loss per share (basic and diluted) (in dollars per share) $ (0.25) $ (0.16) $ (0.15) $ (0.20) $ (0.16) $ (0.15) $ (0.26) $ (0.39) $ (0.76) $ (0.95) $ (1.45)