| Summary of carrying value of goodwill | 
   
   
   |  |  |  |  |  |  |  |  |  |  |  |  |  |  
   |  |  | Gross Amount
 |  |  | Accum. Impairment
 Losses
 |  |  | Net Amount
 |  |  
   | Balance at January 1, 2011 |  | $ | 23,077 |  |  | $ | (4,430 | ) |  | $ | 18,647 |  |  
   | Adjustment to goodwill |  |  | 207 |  |  |  | — |  |  |  | 207 |  |  
   |  |  |   |   |  |  |   |   |  |  |   |   |  |  
   | Balance at December 31, 2011 |  | $ | 23,284 |  |  | $ | (4,430 | ) |  | $ | 18,854 |  |  
   | Impairment loss on goodwill |  |  | — |  |  |  | (18,854 | ) |  |  | (18,854 | ) |  
   |  |  |   |   |  |  |   |   |  |  |   |   |  |  
   | Balance at December 29, 2012 |  | $ | 23,284 |  |  | $ | (23,284 | ) |  | $ | — |  |  
   |  |  |   |   |  |  |   |   |  |  |   |   |  |  | 
      
        | Summary of intangible assets, excluding goodwill | 
   
   
   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
   |  |  |  |  |  | December 29, 2012 |  |  | December 31, 2011 |  |  
   |  |  | Useful Life |  |  | Gross Carrying
 Amount
 |  |  | Accum. Amort. and
 Impairment
 |  |  | Net Carrying
 Amount
 |  |  | Gross Carrying
 Amount
 |  |  | Accum. Amort. and
 Impairment
 |  |  | Net Carrying
 Amount
 |  |  
   | Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
   | Websites |  |  | 5 years |  |  | $ | 2,035 |  |  | $ | (2,035 | ) |  | $ | — |  |  | $ | 2,035 |  |  | $ | (1,001 | ) |  | $ | 1,034 |  |  
   | Internet platform intellectual property 
    |  |  | 10 months |  |  |  | 4,300 |  |  |  | (4,300 | ) |  |  | — |  |  |  | 4,300 |  |  |  | (4,300 | ) |  |  | — |  |  
   | Product design intellectual property 
   
   (1) |  |  | 2 years |  |  |  | 2,750 |  |  |  | (722 | ) |  |  | 2,028 |  |  |  | 2,750 |  |  |  | (416 | ) |  |  | 2,334 |  |  
   | Customer relationships 
    |  |  | 4 years |  |  |  | 2,050 |  |  |  | (2,050 | ) |  |  | — |  |  |  | 2,050 |  |  |  | (712 | ) |  |  | 1,338 |  |  
   | Assembled workforce |  |  | 7 years |  |  |  | 512 |  |  |  | (512 | ) |  |  | — |  |  |  | 481 |  |  |  | (275 | ) |  |  | 206 |  |  
   | Favorable lease 
    |  |  | 2.5 years |  |  |  | 78 |  |  |  | (78 | ) |  |  | — |  |  |  | 78 |  |  |  | (56 | ) |  |  | 22 |  |  
   | Domain and trade names
    (2) 
    |  |  | 10 years |  |  |  | 5,067 |  |  |  | (3,868 | ) |  |  | 1,199 |  |  |  | 5,050 |  |  |  | — |  |  |  | 5,050 |  |  
   |  |  |  |  |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  
   | Total |  |  |  |  |  | $ | 16,792 |  |  | $ | (13,565 | ) |  | $ | 3,227 |  |  | $ | 16,744 |  |  | $ | (6,760 | ) |  | $ | 9,984 |  |  
   |  |  |  |  |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |  |   |   |  |    |