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Quarterly Results for Continuing Operations - Quarterly Information for the Applicable Time Periods (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly information for the applicable time periods |  |  |  |  |  |  |  |  |  |
Net sales | $ 12,872 | $ 13,268 | $ 12,960 | $ 8,030 | $ 9,397 | $ 8,673 | $ 11,444 | $ 8,298 | $ 47,130 | $ 37,812
Gross Profit (Loss) | 1,092 | 1,076 | 816 | (556) | 150 | (451) | 1,226 | 91 | 2,428 | 1,016
Net income (loss) | $ 2,366 | $ (1,040) | $ (1,059) | $ (2,495) | $ (1,704) | $ (2,624) | $ 151 | $ (2,883) | $ (2,228) | $ (7,060)
Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |
Basic | $ 0.27 | $ (0.13) | $ (0.13) | $ (0.31) | $ (0.21) | $ (0.33) | $ 0.01 | $ (0.36) | $ (0.30) | $ (0.89)

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