Commitments and Contingencies - Concentrations (Details)	3 Months Ended
Mar. 31, 2019 product	Jul. 31, 2018 ft² a
Concentrations
Size of building space \| ft²		70,000
Area of Land \| a		8.6
Vendor
Concentrations
Number of products from which revenue is derived \| product	4

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.

No definition available.

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