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Commitments and Contingencies - Textual (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Lease Commitments      
Future Sublease Rentals $ 300,000    
Lease Incentive Received 1,200,000    
Unamortized Lease Incentive 300,000    
Rent Expense 3,500,000 3,600,000 2,100,000
Purchase Commitments      
Accrued Excess and Obsolete Inventory At Contract Manufacturer 1,357,000 3,784,000  
Non-Cancelable Outstanding Purchase Orders 10,300,000    
Litigation      
Trading profits $ 500,000    
Minimum [Member]
     
Accrued Warranty      
Product Warranty Period 1 year    
Maximum [Member]
     
Accrued Warranty      
Product Warranty Period 5 years