Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies and Nature of Operations - Additional Information (Details)

v3.20.1
Summary of Significant Accounting Policies and Nature of Operations - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 28, 2019
USD ($)
Sep. 28, 2019
USD ($)
Jun. 29, 2019
USD ($)
Mar. 30, 2019
USD ($)
Dec. 28, 2019
USD ($)
item
Dec. 29, 2018
USD ($)
Jan. 01, 2019
USD ($)
Dec. 30, 2017
USD ($)
Property, Plant and Equipment [Line Items]                
Net income (loss) $ 25,086,000 $ 1,424,000 $ 1,457,000 $ 3,581,000 $ 31,548,000 $ 4,889,000    
Operating Loss Carryforwards, Valuation Allowance 23,015,000       $ 23,015,000      
Number of suppliers | item         1      
Inventory in-transit 14,502,000       $ 14,502,000 9,701,000    
Capitalized website and software development costs         55,000 $ 49,000    
Impairment loss on intangible assets         0      
Impairment loss on property and equipment         $ 0      
Advertising revenue as a percentage of total revenue         1.00% 1.00%    
Credits for returned products         $ 18,436,000 $ 19,691,000    
Number of customer accounted for 10 %         0.00%      
Warranty, coverage period         30 days      
Warranty, unlimited product replacement, coverage period         5 years      
Warranty, one-time product replacement, coverage period, option one         5 years      
Warranty, one-time product replacement, coverage period, option two         3 years      
Advertising costs         $ 25,691,000 20,942,000    
Unrecognized tax benefits, interest or penalties 0       0      
Cumulative effect adjustment (167,876,000)       (167,876,000) (137,791,000)    
Right-of-use (“ROU”) assets 4,544,000       4,544,000      
Operating lease liabilities 4,787,000       $ 4,787,000      
Minimum                
Property, Plant and Equipment [Line Items]                
Length Of Fiscal Year         364 days      
Standard product warranty, recognition period         1 year      
Maximum                
Property, Plant and Equipment [Line Items]                
Length Of Fiscal Year         371 days      
Standard product warranty, recognition period         5 years      
Website and Software Development                
Property, Plant and Equipment [Line Items]                
Capitalized website and software development costs         $ 4,907,000 3,883,000    
Capitalized website and software development cost amount 24,142,000       24,142,000 19,234,000   $ 1,000
Capitalized website and software development costs accumulated amortization and impairment amount $ 20,740,000       $ 20,740,000 16,425,000    
Website and Software Development | Minimum                
Property, Plant and Equipment [Line Items]                
Amortization on a straight-line basis, period         2 years      
Website and Software Development | Maximum                
Property, Plant and Equipment [Line Items]                
Amortization on a straight-line basis, period         3 years      
Cost of Sales                
Property, Plant and Equipment [Line Items]                
Freight and shipping expenses         $ 47,140,000 43,674,000    
Employee Stock Option | Minimum                
Property, Plant and Equipment [Line Items]                
Stock options vesting period         3 years      
Employee Stock Option | Maximum                
Property, Plant and Equipment [Line Items]                
Stock options vesting period         4 years      
Accumulated Deficit                
Property, Plant and Equipment [Line Items]                
Net income (loss)         $ 31,548,000 4,889,000    
Effect of new accounting adoption           $ 1,623,000   $ 255,000
ASU 2016-02 | Accumulated Deficit                
Property, Plant and Equipment [Line Items]                
Effect of new accounting adoption             $ 1,623,000