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, 2019
USD ($)
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligation $ 218,047
Reductions for Settling Warranties (62,394)
Warranties Issued During Period 85,877
Accrued Warranty Obligations $ 241,530