Registration of securities issued in business combination transactions

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life   3 years
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years 3 years
Tooling    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years 3 years
Software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life   3 years
Minimum | Equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 2 years 3 years
Minimum | Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Minimum | Software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 2 years  
Maximum | Equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 12 years 5 years
Maximum | Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 5 years  
Maximum | Software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years