Annual report pursuant to Section 13 and 15(d)

Accrued Expenses (Changes in Accrued Warranty Obligations) (Detail)

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Accrued Expenses (Changes in Accrued Warranty Obligations) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Class Of Warrant Or Right [Line Items]    
Accrued Warranty Obligations $ 39,624 $ 31,619
Reductions for Settling Warranties (67,858) (96,460)
Warranty Issued During Year 92,236 104,465
Accrued Warranty Obligations $ 64,002 $ 39,624