Quarterly report pursuant to Section 13 or 15(d)

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

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Accrued Expenses (Changes in Accrued Warranty Obligations) (Detail)
3 Months Ended
Mar. 31, 2017
USD ($)
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligations at December 31, 2016 $ 41,132
Reductions for Settling Warranties (24,188)
Warranty Issued During Year 37,648
Accrued Warranty Obligations at March 31, 2017 $ 54,592