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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 106,100 $ 78,292
Less: Accumulated depreciation (61,804) (37,854)
Property and equipment, net 44,296 40,438
Tooling and Molds [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 70,368 50,125
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 18,366 14,894
Computer Equipment, Software and Other [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 8,401 5,628
Furniture, Fixtures and Warehouse Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 8,868 7,282
Construction in Progress [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 97 $ 363