Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Summary of Significant Accounting Policies and Nature of Operations - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jul. 01, 2017
USD ($)
Apr. 01, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 01, 2016
USD ($)
Jul. 02, 2016
USD ($)
Apr. 02, 2016
USD ($)
Dec. 30, 2017
USD ($)
supplier
Dec. 31, 2016
USD ($)
segment
Jan. 02, 2016
USD ($)
Property, Plant and Equipment [Line Items]                      
Percentage increase (decrease) in revenues                   4.30%  
Net (loss) income $ (4,079,000) $ 919,000 $ 26,918,000 $ 257,000 $ (1,914,000) $ (360,000) $ 681,000 $ 990,000 $ 24,015,000 $ (603,000) $ (2,424,000)
Other-than-temporary impairment charges on investments                 $ 0 0 0
Number of suppliers products are available from (more than) | supplier                 1    
Inventory in-transit 10,164,000       9,767,000       $ 10,164,000 9,767,000  
Capitalized website and software development costs                 56,000 83,000 146,000
Impairment loss on intangible assets         1,130,000       0 $ 1,130,000 $ 0
Impairment loss on property and equipment                 $ 0    
Catalog amortization period                 9 months    
Advertising revenue as a percentage of total revenue                 1.00% 1.00% 1.00%
Credits for returned products                 $ 21,838,000 $ 23,876,000 $ 23,543,000
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                 $ 21,055,000 $ 22,616,000 20,251,000
Unrecognized tax benefits, interest or penalties 0               0    
Number of operating segments | segment                   2  
Effect of new accounting adoption         0         $ 0  
Decrease to accumulated deficit due to adoption of new accounting pronouncement (132,996,000)       (156,520,000)       $ (132,996,000) (156,520,000)  
Minimum                      
Property, Plant and Equipment [Line Items]                      
Standard product warranty, recognition period                 1 year    
Maximum                      
Property, Plant and Equipment [Line Items]                      
Standard product warranty, recognition period                 5 years    
Website and Software Development                      
Property, Plant and Equipment [Line Items]                      
Capitalized website and software development costs                 $ 3,914,000 4,977,000  
Capitalized website and software development cost amount 17,974,000       22,366,000       17,974,000 22,366,000  
Capitalized website and software development costs accumulated amortization and impairment amount 14,429,000       18,520,000       $ 14,429,000 18,520,000  
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    
Other Current Assets                      
Property, Plant and Equipment [Line Items]                      
Deferred catalog expenses 5,000       160,000       $ 5,000 160,000  
Cost of Sales                      
Property, Plant and Equipment [Line Items]                      
Freight and shipping expenses                 $ 40,565,000 41,937,000 41,250,000
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    
Additional Paid-in- Capital                      
Property, Plant and Equipment [Line Items]                      
Effect of new accounting adoption         249,000         249,000  
Accumulated Deficit                      
Property, Plant and Equipment [Line Items]                      
Net (loss) income                 $ 24,015,000 731,000 $ (1,281,000)
Effect of new accounting adoption         (249,000)         (249,000)  
Accounting Standards Update 2016-09 | Additional Paid-in- Capital                      
Property, Plant and Equipment [Line Items]                      
Effect of new accounting adoption         249,000         249,000  
Accounting Standards Update 2016-09 | Accumulated Deficit                      
Property, Plant and Equipment [Line Items]                      
Effect of new accounting adoption         $ (249,000)         $ (249,000)  
Pro Forma | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                      
Property, Plant and Equipment [Line Items]                      
Decrease to accumulated deficit due to adoption of new accounting pronouncement $ 342,000               $ 342,000