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Share-Based Compensation (Details) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Sep. 28, 2012
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Stock options
Sep. 28, 2012
Stock options
Sep. 30, 2011
Stock options
Sep. 28, 2012
Restricted stock units (RSUs)
Sep. 28, 2012
Restricted stock units (RSUs)
Sep. 30, 2011
Restricted stock units (RSUs)
Sep. 28, 2012
Option Plan
Sep. 30, 2011
Option Plan
Aug. 07, 2012
Equity Incentive Plan - 2005
Restricted stock units (RSUs)
Intstallment
Sep. 28, 2012
Equity Incentive Plan - 2005
Restricted stock units (RSUs)
Sep. 28, 2012
Employee Stock Purchase Plan - 2005
Sep. 30, 2011
Employee Stock Purchase Plan - 2005
Sep. 28, 2012
Employee Stock Purchase Plan - 2005
Employee Stock
Sep. 28, 2012
Cost of revenue
Sep. 30, 2011
Cost of revenue
Sep. 28, 2012
Research and development
Sep. 30, 2011
Research and development
Sep. 28, 2012
Sales and marketing
Sep. 30, 2011
Sales and marketing
Sep. 28, 2012
General and administrative
Sep. 30, 2011
General and administrative
Aug. 07, 2012
Minimum
Equity Incentive Plan - 2005
Restricted stock units (RSUs)
Aug. 07, 2012
Maximum
Equity Incentive Plan - 2005
Restricted stock units (RSUs)
Share-based compensation:                                                    
Share-based compensation expense   $ 2,511,000 $ 2,069,000                           $ 500,000 $ 282,000 $ 539,000 $ 515,000 $ 386,000 $ 361,000 $ 1,086,000 $ 911,000    
Weighted average fair value assumptions:                                                    
Risk-free interest rate                   0.70% 1.10%     0.20% 0.10%                      
Volatility                   67.60% 75.60%     83.00% 80.00%                      
Weighted average expected life                   5 years 4 years 7 months 28 days     1 year 3 months 1 year 3 months                      
Expected dividend yield                   0.00% 0.00%     0.00% 0.00%                      
Weighted average fair value (USD per share)                   $ 3.67 $ 8.66     $ 4.39 $ 6.43                      
Options outstanding, shares:                                                    
Options outstanding, beginning of period (in shares)   3,703,660                                                
Options granted (in shares)   64,000                                                
Options exercised (in shares)   (105,073)                                                
Options cancelled (in shares)   (109,784)                                                
Options outstanding, end of period (in shares) 3,552,803 3,552,803                                                
Vested and expected to vest (in shares) 3,324,688 3,324,688                                                
Exercisable (in shares) 2,280,623 2,280,623                                                
Options outstanding, weighted average exercise price:                                                    
Options outstanding, beginning balance, weighted average exercise price (USD per share)   $ 10.79                                                
Options granted, weighted average exercise price (USD per share)   $ 6.62                                                
Options exercised, weighted average exercise price (USD per shares)   $ 5.33                                                
Options cancelled, weighted average exercise price (USD per share)   $ 11.63                                                
Options outstanding, ending balance, weighted average exercise price (USD per share) $ 10.85 $ 10.85                                                
Vested and expected to vest, weighted average exercise price (USD per share) $ 10.90 $ 10.90                                                
Exercisable, weighted average exercise price (USD per share) $ 11.41 $ 11.41                                                
Options outstanding, weighted average remaining contractual term 5 years 5 months 9 days                                                  
Vested and expected to vest, weighted average remaining contractual term 5 years 2 months 12 days                                                  
Exercisable, weighted average remaining contractual term 3 years 6 months 18 days                                                  
Options outstanding, aggregate intrinsic value 3,657,000 3,657,000                                                
Vested and expected to vest, aggregate intrinsic value 3,399,000 3,399,000                                                
Exercisable, aggregate intrinsic value 2,205,000 2,205,000                                                
Total intrinsic value of options exercised in period         300,000 800,000                                        
Total fair value of shares vested during period         900,000 700,000                                        
Total unrecognized compensation cost related to non-vested awards, options       3,000,000 3,000,000                                          
Total compensation cost related to non-vested awards, period for recognition       1 year 3 months 11 days     3 years 1 month 24 days                                      
Restricted stock activity, number of shares:                                                    
Equity intstruments other than options, outstanding, beginning of period (in shares)               918,764                                    
Equity intstruments other than options, awarded (in shares)               774,489                                    
Equity intstruments other than options, released (in shares)               (65,035)                                    
Equity intstruments other than options, forfeited (in shares)               (88,844)                                    
Equity intstruments other than options, outstanding, end of period (in shares)             1,539,374 1,539,374                                    
Number of shares authorized for grant                       185,000 231,250                          
Inital vesting percentage                       25.00%                            
Annual vesting percentage                       75.00%                            
Number of annual vesting installments                       3                            
Duration of annual vesting                       3 years                            
Performance-based award authorization percentage                         125.00%                       50.00% 150.00%
Performance metrics acheivement assumption percentage                         100.00%                          
Equity instruments other than options, vested and expected to vest (in shares)             1,124,163 1,124,163                                    
Total unrecognized compensation cost related to non-vested awards, equity instruments other than options             9,200,000 9,200,000               2,200,000                    
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term                               1 year 10 months 24 days                    
Shares withheld for taxes (in shares)               24,381 29,366                                  
Amounts withheld for taxes   $ 202,000 $ 420,000         $ 188,000 $ 420,000                                  
Employee Stock Purchase Plan:                                                    
Shares issued (in shares)   256,972 259,347                                              
Weighted-average purchase price per share (USD per share)   $ 6.76 $ 5.99