Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Textual)

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Organization and Summary of Significant Accounting Policies (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Segment
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]    
Number of operating business segments   1
Non-cash gain on a decrease in the fair value of warrant liabilities $ 5.4 $ 2.3