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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