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Shareholders' Equity (Detail Textuals)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended
Jul. 09, 2015
$ / shares
shares
Jul. 07, 2015
Holder
shares
Jun. 30, 2015
USD ($)
shares
Jun. 26, 2015
USD ($)
$ / shares
Jun. 25, 2015
Holder
Feb. 27, 2015
Sep. 30, 2015
USD ($)
shares
Dec. 31, 2014
shares
Sep. 30, 2014
shares
Shareholders Equity [Line Items]                  
Warrants exchanged for shares of common stock             883,057 406,736  
Exchange Agreement                  
Shareholders Equity [Line Items]                  
Inducement loss | $     $ 0.1            
Exchange premium percentage     15.00%            
Loss on extinguishment of debt | $     $ 0.4            
February 2015 Offering                  
Shareholders Equity [Line Items]                  
Net proceeds from February 2015 offering | $             $ 10.6    
February 2015 Offering | Exchange Agreement                  
Shareholders Equity [Line Items]                  
Percentage of beneficial ownership in excess of         9.99%        
June 2015 Offering                  
Shareholders Equity [Line Items]                  
Net proceeds from February 2015 offering | $       $ 5.0          
Purchase price of units per share (in dollars per share) | $ / shares       $ 3.65          
Series F warrant                  
Shareholders Equity [Line Items]                  
Exercise price of the warrants, per share (in dollars per share) | $ / shares $ 1.2432                
Series A and Series C Warrant | February 2015 Offering | Exchange Agreement                  
Shareholders Equity [Line Items]                  
Number of warrant holders | Holder         2        
Percentage of common stock issuable upon exercise of Warrants         115.00%        
Class A common stock                  
Shareholders Equity [Line Items]                  
Percentage of number of shares of Common stock           50.00%      
Shares issued upon exercise of warrants             3,021,581   8,363
Purchase price of common stock, per share (in dollars per share) | $ / shares $ 1.2432                
Number of shares delivered to investors 2,652,020                
Class A common stock | Exchange Agreement                  
Shareholders Equity [Line Items]                  
Shares issued upon exercise of warrants   1,243,614 84,390            
Number of warrant holders | Holder   1     1        
Warrants exchanged for shares of common stock   1,081,403 73,382            
Class A common stock | June 2015 Offering                  
Shareholders Equity [Line Items]                  
Percentage of number of shares of Common stock       30.00%