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Other Financial Statement Information (Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property Plant And Equipment [Line Items]    
Total property and equipment $ 2,611 $ 2,612
Less: accumulated depreciation and amortization (2,342) (2,197)
Net property and equipment 269 415
Leased Equipment [Member]
    
Property Plant And Equipment [Line Items]    
Total property and equipment 89 89
Equipment [Member]
    
Property Plant And Equipment [Line Items]    
Total property and equipment 1,202 1,192
Leasehold Improvements [Member]
    
Property Plant And Equipment [Line Items]    
Total property and equipment 381 381
Demonstration Equipment [Member]
    
Property Plant And Equipment [Line Items]    
Total property and equipment 5 5
Purchased Software [Member]
    
Property Plant And Equipment [Line Items]    
Total property and equipment 365 373
Furniture And Fixtures [Member]
    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 569 $ 572