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Warrants (Tables)
 6 Months Ended
Jun. 30, 2015
Rollforward of Preferred Stock Warrants

The following represents a summary of the warrants outstanding at each of the dates identified:

 

                        Number of Shares Underlying Warrants  

Warrants

    Issue Date    Classification      Exercisable For      June 30, 2015      December 31, 2014  

Preferred Stock Warrants

    Various      Liability         Preferred Stock         —           14,544,247   

Private Placement Warrants

    June 15, 2015      Equity         Common Stock         3,190,030         —     

Hercules Warrants

    June 15, 2015      Equity         Common Stock         25,150         —     

Warrants Assumed in Merger

               

Series A Warrants

    March - May 2015      Equity         Common Stock         1,219,000         —     

Representative’s Warrants

    March 2015      Equity         Common Stock         37,100         —     

Underwriter’s Warrant

    March 2015      Equity         Common Stock         2,160         —     
Preferred Stock Warrants [Member]  
Rollforward of Preferred Stock Warrants

A rollforward of the Preferred Stock Warrants is as follows:

 

     Preferred Stock
Warrants		     Estimated Fair
Value		  

Balance—December 31, 2014

      14,544,247      $ 1,309   

Decrease in estimated fair value of warrants

      —          (1,309 ) 

Cancellation and gain (loss) on extinguishment

      (14,544,247 )      —     
  

 

 

    

 

 

  

Balance—June 30, 2015

      —        $ —