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Nature of Operations and Summary of Significant Accounting Policies (Estimated Useful Lives Used To Compute Depreciation And Amortization) (Details)
9 Months Ended
Sep. 30, 2013
Equipment [Member] | Minimum [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 3 years
Equipment [Member] | Maximum [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 5 years
Demonstration Equipment [Member] | Minimum [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 3 years
Demonstration Equipment [Member] | Maximum [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 5 years
Furniture And Fixtures [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 7 years
Purchased Software [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 3 years
Leased Equipment [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 3 years
Leasehold Improvements [Member]
 
Property Plant And Equipment [Line Items]  
Estimated useful life 5 years