Annual report pursuant to Section 13 and 15(d)

Accrued Expenses (Components of Accrued Expenses) (Detail)

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Accrued Expenses (Components of Accrued Expenses) (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities [Line Items]    
Accrued Wages and Related Costs $ 461,619 $ 163,305
Accrued Compensation 0 327,469
Accrued Professional Services 138,438 531,728
Accrued Warranty Obligations 218,047 167,503
Accrued Interest 0 171,435
Other Accrued Expenses 795,974 28,331
Total $ 1,614,078 $ 1,389,771