Summary of Significant Accounting Policies - Property and equipment (Details)	12 Months Ended
	Dec. 31, 2019
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Software
Property, Plant and Equipment [Line Items]
Useful life	3 years
Machinery & production equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Machinery & production equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Furniture & fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Furniture & fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life	5 years