Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Components of Accrued Expenses) (Detail)

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Accrued Expenses (Components of Accrued Expenses) (Detail) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Accrued Liabilities [Line Items]    
Accrued Wages and Related Costs $ 281,286 $ 461,619
Accrued Professional Services 123,967 138,438
Accrued Warranty Obligations 241,530 218,047
Other Accrued Expenses 296,227 795,974
Total $ 943,010 $ 1,614,078