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Equity Method Investments - Additional Information (Detail) - USD ($)			3 Months Ended		9 Months Ended
	Jul. 07, 2017	Jun. 27, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity Method Investments [Line Items]
Loss from equity method investment			$ (115,000)	$ (180,000)	$ (226,000)	$ (309,000)
Investment		$ 950,000			$ 950,000	3,283,000
Profeng Australia, Pty Ltd
Equity Method Investments [Line Items]
Joint venture, consideration	$ 1,900,000
TyraTech Inc.
Equity Method Investments [Line Items]
Equity investment ownership position			15.11%		15.11%
Loss from equity method investment			$ (29,000)	(180,000)	$ (140,000)	(309,000)
Carrying value of equity investment			2,044,000		2,044,000
Quoted market value of equity investment			$ 1,210,000		$ 1,210,000
Hong Kong Joint Venture
Equity Method Investments [Line Items]
Equity investment ownership position			50.00%		50.00%
Loss from equity method investment			$ (86,000)	$ 0	$ (86,000)	$ 0