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)
9 Months Ended
Sep. 30, 2018
USD ($)
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligations at December 31, 2017 $ 167,503
Reductions for Settling Warranties (259,905)
Warranties Issued During Period 373,254
Accrued Warranty Obligations at September 30, 2018 $ 280,852