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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales from continuing operations | $ 4,727 | $ 5,002 | $ 6,011 | $ 4,106 | $ 7,186 | $ 8,261 | $ 7,126 | $ 8,425 | $ 19,846 | $ 30,998 | $ 64,403
Gross profit from continuing operations | 1,622 | 1,137 | 1,501 | 561 | (1,072) | 3,082 | 2,522 | 3,145 | 4,821 | 7,677 | 29,292
Net loss from continuing operations | (1,858) | (1,773) | (3,114) | (4,522) | (7,805) | (3,177) | (3,916) | (1,977) | (11,267) | (16,875) | 9,471
Loss from discontinued operations | 0 | 0 | 0 | 0 | 0 | 0 | 0 | (12) | 0 | (12) | (691)
Net (loss) income | $ (1,858) | $ (1,773) | $ (3,114) | $ (4,522) | $ (7,805) | $ (3,177) | $ (3,916) | $ (1,989) | $ (11,267) | $ (16,887) | $ 8,780
Denominator: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income from continuing operations (in dollars per share) | $ (0.16) | $ (0.15) | $ (0.26) | $ (0.39) |  |  |  |  |  |  |
Net loss from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.00 | 0.00 |  |  |  |  |  |  |
Net loss (in dollars per share) | $ (0.16) | $ (0.15) | $ (0.26) | $ (0.39) |  |  |  |  |  |  |
Net (loss) income per share - basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations (in dollars per share) |  |  |  |  | $ (0.67) | $ (0.27) | $ (0.34) | $ (0.17) | $ (0.95) | $ (1.45) | $ 0.91
Net (loss) income from discontinued operations (in dollars per share) |  |  |  |  | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | (0.07)
Net income (loss) (in dollars per share) |  |  |  |  | $ (0.67) | $ (0.27) | $ (0.34) | $ (0.17) | (0.95) | (1.45) | 0.84
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | (0.95) | (1.45) | 0.88
Net (loss) income from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.06)
Net income (loss) (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.95) | $ (1.45) | $ 0.82

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