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SIGNIFICANT ACCOUNTING POLICIES - Provisions and Warranties (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Warranty liability $ 65,591 $ 65,591
Beginning balance warranty liability 65,591 70,250
Warranties assumed in period 128,599 384,214
Payments (136,756) (388,873)
Ending balance warranty liability $ 57,434 $ 65,591