Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
Computer and office equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer and office equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years