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Marketable Securities and Fair Value Measurements (Details 3) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Increase in fair value included in change in fair value of common stock warrants $ 406,000 $ (290,000)
Using Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at January 1, 2016 1,301,138  
Increase in fair value included in change in fair value of common stock warrants 406,249  
Balance at March 31, 2016 $ 1,707,387