Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details)

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Organization and Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair value of the warrant liability    
Total warrant liability at December 31, 2012 $ 8,240  
Fair value of warrants transferred to equity upon exercise (4,686)  
Adjustment to record warrants at fair value upon exercise and at March 31, 2013 3,045 16
Total warrant liability at March 31, 2013 $ 6,599