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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Public Utility Property, Plant, and Equipment [Table Text Block]
Production machinery and equipment  2 to 7 years
Vehicles  3 to 7 years
Leasehold improvements  shorter of lease term or 7 years
Demo fleet systems  2 to 3 years
Furniture and fixtures  3 years
Computers and related equipment  3 to 7 years