Discontinued Operations - Summary of Operating Results (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]
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Net sales	$ 7,750	$ 11,629	$ 14,163	$ 18,444
Cost of sales	8,301	11,172	16,032	18,688
Gross margin	(551)	457	(1,869)	(244)
Operating expenses:
Research and development	42	78	85	183
Selling and marketing	641	568	1,231	1,042
General and administrative	618	399	1,273	975
Total operating expenses	1,301	1,045	2,589	2,200
Loss from discontinued operations	(1,852)	(588)	(4,458)	(2,444)
Other income (expense):
Interest expense and other, net	(127)	(356)	(380)	(505)
Loss from discontinued operations before income taxes	(1,979)	(944)	(4,838)	(2,949)
Net loss from discontinued operations	$ (1,979)	$ (944)	$ (4,838)	$ (2,949)

Disposal group including discontinued operation, interest expense and other, net.

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Disposal group including discontinued operation, other income (expense).

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Disposal group including discontinued operation operating expenses.

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Disposal group including discontinued operation research and development expense.

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Disposal group including discontinued operation selling and marketing expense.

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Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Indicates business segment that includes component or group of components disposed of or classified as held-for-sale representing strategic shift that has or will have major effect on operation and financial result.

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Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of general and administrative expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of gross profit attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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