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)
6 Months Ended
Jun. 30, 2017
USD ($)
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligations at December 31, 2016 $ 41,132
Reductions for Settling Warranties (57,718)
Warranty Issued During Year 92,189
Accrued Warranty Obligations at June 30, 2017 $ 75,603