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Financing Transactions (Loan Agreement with GE Capital) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2015
Mar. 30, 2012
Loans Payable [Member]    
Debt Instrument [Line Items]    
Debt instrument, carrying amount   $ 2.5
Warrants issued to purchase common stock, in connection with loan agreement 46,584  
Warrant exercise price $ 1.61  
Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity   $ 5.0