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Accrued Expenses - Components of Accrued Expenses (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Accrued Expenses    
Accrued Wages and Related Costs $ 305,543 $ 461,619
Accrued Professional Services 183,143 138,438
Accrued Warranty Obligations 235,244 218,047
Other Accrued Expenses 154,360 795,974
Total $ 878,290 $ 1,614,078