Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Accrued Expenses (Changes in Accrued Warranty Obligations) (Detail)
3 Months Ended
Mar. 31, 2018
USD ($)
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligations at December 31, 2017 $ 167,503
Reductions for Settling Warranties (92,547)
Warranties Issued During Period 123,060
Accrued Warranty Obligations at March 31, 2018 $ 198,016