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Summary of Significant Accounting Policies - Cost of Sales (Details)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Periot to reflect a lower average per unit cost of materials	18 months
In-Process Research and Development
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	14 years

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- Definition

Cost Of Goods And Services Sold, Period Reflecting Lower Average Per Unit Cost Of Materials

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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