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The Company and Summary of Significant Accounting Policies (Details) (USD $)
 1 Months Ended 12 Months Ended 132 Months Ended
Feb. 25, 2013
Dec. 31, 2012
Segment
Dec. 31, 2011
Dec. 31, 2012
The Company and Summary of Significant Accounting Policies (Textual) [Abstract]        
Anticipated time to start AF Trial   6 months    
Loss from operations   $ (4,319,000) $ (7,361,000) $ (99,143,000)
Fund raised through sale of common stock   1,528,000 4,726,000 14,109,000
New funds raised by the company   1,500,000   1,500,000
Cash flows from operations   (4,078,000) (6,959,000) (97,421,000)
Reverse stock split 1 for 6 reverse split 1 for 20 reverse stock split    
Merger conversion ratio   0.16698070    
Cash and cash equivalents maturity period   90 days or less    
Revenue generated by the company   $ 0    
Number of segments   1    
Minimum [Member]
        
Company and Summary of Significant Accounting Policies Table [Line Items]        
Number of patients company plans to enroll   200    
Maximum [Member]
        
Company and Summary of Significant Accounting Policies Table [Line Items]        
Number of patients company plans to enroll   420