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Summary of significant accounting policies - Schedule of Useful Lives by Major Asset Class (Details)	12 Months Ended
	Dec. 31, 2018
Machinery, equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Machinery, equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Store fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Store fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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