v2.4.0.6
Summary of Significant Accounting Policies (Details Textual) (USD $)
Share data in Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Customer
Jan. 01, 2011
Jan. 02, 2010
Summary of Significant Accounting Policies (Textual) [Abstract]      
Revenue from two International Distributors of home robots products 36.10% 38.40% 36.90%
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Cash equivalents comprised of money market and savings account funds $ 117,200,000 $ 93,400,000  
Exceeded Insurance Limits by Company 187,500,000 125,400,000  
Customer portion accounted for accounts receivable   19.00%  
Customer portion accounted for accounts receivable, securing balance with guaranteed letters of credit   22.00%  
Number of customers with accounts receivable balance greater than 10% of total receivables 4    
Percentage of receivables held by four customers 63.00%    
Minimum percentage help by each customer with an accounts receivable balance greater than 10% of the total accounts receivable balance 10.00%    
Percentage of receivables secured by guaranteed letter of credit for customers with accounts receivable balance greater than 10% of the total accounts receivable balance 29.00%    
Advertising cost 20,400,000 13,800,000 7,000,000
Potentially diluted shares of common stock 0.4 1.0 2.3
Total net deferred tax assets 21,471,000 21,255,000  
Boeing Company [Member]
     
Summary of Significant Accounting Policies (Textual) [Abstract]      
Revenue from two International Distributors of home robots products 9.40% 17.40%  
International distributors of home robots products [Member]
     
Summary of Significant Accounting Policies (Textual) [Abstract]      
Revenue from two International Distributors of home robots products 23.60%    
Maximum [Member]
     
Property Plant And Equipment [Line Items]      
Operating and Reporting Period 371 days    
Minimum [Member]
     
Property Plant And Equipment [Line Items]      
Operating and Reporting Period 364 days    
Software [Member]
     
Property Plant And Equipment [Line Items]      
Capitalized Costs 8,300,000 5,800,000  
Amortization Expense $ 800,000 $ 900,000 $ 900,000