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Summary of Significant Accounting Policies - Useful Life of Property and Equipment, Net (Details)
12 Months Ended
Dec. 31, 2019
Machinery and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life (in years) 3 years
Machinery and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life (in years) 5 years
Furniture and fixtures  
Property, Plant and Equipment [Line Items]  
Useful life (in years) 7 years
Computer hardware and computer software  
Property, Plant and Equipment [Line Items]  
Useful life (in years) 3 years