v2.4.0.6
Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2012
Agreement
Oct. 01, 2011
Sep. 29, 2012
Agreement
Oct. 01, 2011
Dec. 31, 2011
Concentration Risk [Line Items]          
Leasehold improvement incentives received $ 0.7   $ 0.7    
Accrued rent expense 0.8   0.8   0.3
Rental expense related to operating leases 1.2 1.0 3.3 2.8  
Number of capital leases related to office equipment 5   5    
Employee contribution percentage limit for full consideration under Employee Retirement Savings Plan     100.00%    
Company contribution percentage based on employee contribution of up to 3% of employee's compensation     3.00%    
Company's contribution to employee retirement savings plan 0.4 0.3 1.0 0.9  
Initial term of agreement     3 years    
Severance plan participation agreements 3   3    
Limited severance plan participation agreements 3   3    
Percentage of executive officer's unvested and outstanding stock options     50.00%    
Total amount of purchase commitments expected to be purchased within one year 41.5   41.5    
Bank balances 43.4   43.4   60.8
Bank balance covered by Federal Deposit Insurance Corporation limit 20.3   20.3   25.7
Percentage of accounts receivable balance from one just-in-time distributor     10.00%   5.00%
Percentage Of Accounts Receivable Balance From One Other Just In Time Distributor     9.00%    
Percentage of revenue one customer 15.00% 14.00% 14.00% 14.00%  
Percentage of revenue two customer 11.00% 10.00% 12.00% 10.00%  
Minimum [Member]
         
Concentration Risk [Line Items]          
Interest rates on capital lease     4.50%    
Maximum [Member]
         
Concentration Risk [Line Items]          
Interest rates on capital lease     6.60%    
Facility [Member]
         
Concentration Risk [Line Items]          
Operating lease expiration date     Mar. 01, 2017    
Automobiles [Member]
         
Concentration Risk [Line Items]          
Operating lease expiration date     Jun. 01, 2015    
Pulse Oximetry Products [Member]
         
Concentration Risk [Line Items]          
Sale of company's products to customers $ 62.3 $ 55.2 $ 188.0 $ 166.7