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Schedule of accrued warranty activity (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 1 $ 0
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 2 182,741
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 3 205,404
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 4 (59,728)
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 5 0
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 6 (167,685)
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 7 246,354
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 8 30,344
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 9 2,151,101
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 10 (3,885)
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 11 (7,681)
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 12 91,011
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 13 182,741
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 14 205,404
Summary Of Significant Accounting Policies And Practices Schedule Of Accrued Warranty Activity 15 $ 2,279,831