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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 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 June 30,2013 (5,362) (1,955) (2,317) (1,939)
Total warrant liability at June 30, 2013 $ 1,237   $ 1,237