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Accrued Expenses (Changes in Accrued Warranty Obligations) (Detail)
9 Months Ended
Sep. 30, 2015
USD ($)
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligations at December 31, 2014 $ 39,624
Reductions for Settling Warranties (54,840)
Warranties Issued During Period 75,092
Accrued Warranty Obligations at September 30, 2015 $ 59,876