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Significant Accounting Policies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
segment
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting [Abstract]      
Number of operating segments 1    
Net revenues from customers outside the United States $ 700,000 $ 100,000 $ 100,000
Impairment of Long-Lived Assets [Abstract]      
Impairment charges 0 0 0
Distribution Costs [Abstract]      
Distribution costs 900,000 1,200,000 1,200,000
Advertising Costs [Abstract]      
Advertising costs $ 1,800,000 $ 900,000 $ 800,000