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Equity (Details 2) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2009
Jun. 30, 2014
Equity      
Number of warrants issued   1,000,000  
Warrant exercise price   $ 4.00  
Payments for warrants acquired and canceled $ 2.6    
Warrants repurchase price as a discount to closing price of common stock (as a percentage) 5.00%    
Common stock closing price (in dollars per share)     $ 6.95