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Schedule of accrued warranty activity (Details) | 12 Months Ended
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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

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