Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Financial_Institution	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]
Debt instrument maturity date for cash equivalents	Three months or less
Number of financial institutions | Financial_Institution	1
Allowance for doubtful accounts	$ 294,000	$ 281,000
Unamortized deferred financing costs	168,000	177,000
Amortization of deferred financing costs	191,000	94,000	$ 83,000
Product warranty costs from continuing operations	10,000	818,000	757,000
Expense for new warranties issued	302,000	818,000
Reversal of specific warranty reserves	(292,000)
Advertising costs from continuing operations	211,000	349,000	258,000
Research and development costs incurred from continuing operations	$ 2,198,000	$ 4,054,000	$ 4,215,000
Minimum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Minimum percentage of tax benefit likely to be realized	50.00%
Minimum [Member] | Building [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives of equipment and other property	15 years
Minimum [Member] | Equipment and Other Property [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives of equipment and other property	3 years
Maximum [Member] | Building [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives of equipment and other property	40 years
Maximum [Member] | Equipment and Other Property [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives of equipment and other property	15 years