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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
	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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