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Accrued Liabilities - Other - Summary of Activity in Accrued Warranty and Service Liabilities (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Liability, beginning of year $ 1,176,000 $ 1,145,000
Expense for new warranties issued 302,000 818,000
Accruals assumed in acquisition 165,000  
Accruals related to preexisting warranties (292,000)  
Warranty claims paid (443,000) (582,000)
Adjustments for discontinued operations   (205,000)
Liability, end of period $ 908,000 $ 1,176,000