Quarterly report pursuant to Section 13 or 15(d)

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

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Summary of Significant Accounting Policies and Nature of Operations - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2013
Jun. 29, 2013
Dec. 29, 2012
Sep. 29, 2012
Sep. 28, 2013
Segment
Sep. 29, 2012
Dec. 29, 2012
Dec. 31, 2011
Schedule Of Significant Accounting Policies [Line Items]                
Decrease in revenue, percentage 15.50%       19.10%      
Net loss $ (1,399)     $ (2,711) $ (14,309) $ (5,195) $ (35,978) $ (15,137)
Original maturity of money market funds and short-term investments purchased         90 days      
Other than temporary impairment charges on investments         0 0    
Inventory 40,177   42,727   40,177   42,727  
Inventory in-transit 5,154   6,418   5,154   6,418  
Impairment loss on property and equipment   4,832 1,960   4,832 0    
Impairment loss on intangible assets   1,245 1,745   1,245 0    
Limited warranty description         The Company or the vendors supplying its products provide the Company's customers limited warranties on certain products that range from 30 days to lifetime.      
Standard product warranty useful life, minimum         1 year      
Standard product warranty useful life, maximum         5 years      
Extended product warranty description         The product brands that include the extended warranty coverage are offered at three different service levels: (a) a five year unlimited product replacement, (b) a five year one-time product replacement, and (c) a three year one-time product replacement.      
Advertising costs 4,000     4,977 12,908 16,299    
The likeliness that the tax position will be realized upon ultimate settlement         50.00%      
Unrecognized tax benefits, interest or penalties 0       0      
Number of reportable segments         2      
Number of reporting units         2      
Total expenses incurred 19,153     25,441 70,388 77,927    
Total Assets for Auto MD related to capitalized website and software development costs 73,746   88,877   73,746   88,877  
Segment Revenue, AutoMD 61,724     73,014 195,018 241,169    
Auto MD [Member]
                
Schedule Of Significant Accounting Policies [Line Items]                
Segment Revenue, AutoMD         0      
Website and Software Development [Member] | Minimum [Member]
                
Schedule Of Significant Accounting Policies [Line Items]                
Capitalization amount amortized on straight line basis over a period         2 years      
Website and Software Development [Member] | Maximum [Member]
                
Schedule Of Significant Accounting Policies [Line Items]                
Capitalization amount amortized on straight line basis over a period         3 years      
Website and Software Development [Member] | Auto MD [Member]
                
Schedule Of Significant Accounting Policies [Line Items]                
Total expenses incurred 369     608 1,601 1,715    
Total Assets for Auto MD related to capitalized website and software development costs $ 1,649   $ 2,059   $ 1,649   $ 2,059