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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Net sales from continuing operations $ 7,186 $ 8,261 $ 7,126 $ 8,425 $ 17,249 $ 18,335 $ 16,232 $ 12,587 $ 30,998 $ 64,403 $ 22,700
Gross profit from continuing operations (1,072) 3,082 2,522 3,145 7,571 9,130 7,440 5,151 7,677 29,292 7,778
Net loss from continuing operations (7,805) (3,177) (3,916) (1,977) 1,657 4,398 2,192 1,224 (16,875) 9,471 (4,246)
Loss from discontinued operations 0 0 0 (12) (373) (142) (81) (95) (12) (691) (1,599)
Net (loss) income $ (7,805) $ (3,177) $ (3,916) $ (1,989) $ 1,284 $ 4,256 $ 2,111 $ 1,129 $ (16,887) $ 8,780 $ (5,845)
Denominator:                      
Net (loss) income from continuing operations (in dollars per share) $ (0.67) $ (0.27) $ (0.34) $ (0.17)              
Net loss from discontinued operations (in dollars per share) 0.00 0.00 0.00 0.00              
Net loss (in dollars per share) $ (0.67) $ (0.27) $ (0.34) $ (0.17)              
Net (loss) income per share - basic:                      
Net income (loss) from continuing operations (in dollars per share)         $ 0.14 $ 0.42 $ 0.22 $ 0.13 $ (1.45) $ 0.91 $ (0.55)
Net (loss) income from discontinued operations (in dollars per share)         (0.03) (0.01) (0.01) (0.01) 0.00 (0.07) (0.20)
Net income (loss) (in dollars per share)         0.11 0.41 0.21 0.12 (1.45) 0.84 (0.75)
Income (loss) from continuing operations                      
Net income (loss) from continuing operations (in dollars per share)         0.14 0.41 0.22 0.12 (1.45) 0.88 (0.55)
Net (loss) income from discontinued operations (in dollars per share)         (0.03) (0.01) (0.01) (0.01) 0.00 (0.06) (0.20)
Net income (loss) (in dollars per share)         $ 0.11 $ 0.40 $ 0.21 $ 0.11 $ (1.45) $ 0.82 $ (0.75)