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Significant Accounting Policies - Schedule of Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2018
Tooling and Molds [Member]
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives (in years)	2 years
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Leasehold improvements	Lesser of useful life or term of lease
Minimum [Member] | Furniture, Fixtures and Warehouse Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives (in years)	5 years
Minimum [Member] | Computer Equipment, Software and Other [Member]
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives (in years)	3 years
Maximum [Member] | Furniture, Fixtures and Warehouse Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives (in years)	7 years
Maximum [Member] | Computer Equipment, Software and Other [Member]
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives (in years)	5 years

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

+ Details

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X

- 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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X

- 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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