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, 2013
Dec. 31, 2012
Class Of Warrant Or Right [Line Items]    
Accrued Warranty Obligations $ 93,788 $ 118,611
Reductions for Settling Warranties (74,287) (126,308)
Warranties Issued During Period 12,118 101,485
Accrued Warranty Obligations $ 31,619 $ 93,788