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Derivative Warrant Liabilities (Tables)
 6 Months Ended
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Outstanding Warrants Liabilities

The remaining outstanding warrants as of June 30, 2017 are as follows:

 

Issuance Date  

Outstanding

as of

December 31, 2016

    

Outstanding

as of

June 30, 2017

     Exercise
Price		    

Exercisable

as of

June 30, 2017

     Exercisable Through
                             
Series A (2011)     64,230       -     $ 151.20       -     December 2016
Series A (2013)     57,814       57,814     $ 194.40       57,814     October 2018
Series A (2013)     2,718       2,718     $ 183.60       2,718     April 2023
Series A (2015)     10,139       10,139     $ 91.80       10,139     April 2020
Series A (2016) (a)(b)     10,047       9,279     $ 2.70       9,279     March 2018
Series B (2016) (a)     41,116       41,116     $ 2.70       41,116     March 2022

 

 

(a) These warrants contain a full ratchet anti-dilution price protection so that, in most situations upon the issuance of any Common Stock or securities convertible into Common Stock at a price below the then-existing exercise price of the outstanding warrants, the warrant exercise price will be reset to the lower Common Stock sales price.
   
(b) In March 2017, an institutional holder executed a cashless exercise of 768 warrants and 359 shares of Common Stock were issued in connection therewith.
Schedule of Fair Value Assumption

  The following table summarizes the observable inputs used in the valuation of the derivative warrant liabilities as of December 31, 2016 and June 30, 2017:

 

    As of
June 30, 2017		     As of
December 31, 2016		  
    Series A (2016)     Series B (2016)     Series A (2016)     Series B (2016)  
                         
Share price   $ 1.42     $ 1.42     $ 6.10     $ 6.10  
Exercise price   $ 2.70     $ 2.70     $ 2.70     $ 2.70  
Expected volatility     95 %     96 %     380 %     380 %
Risk-free interest     1.24 %     1.89 %     0.85 %     1.93 %
Dividend yield     —       —       —       —  
Expected life of up to (years)     0.75       4.75       1.2       5.2  
Schedule of Liabilities Measured on a Recurring Basis

Activity in such liabilities measured on a recurring basis is as follows:

 

    Derivative
warrant liabilities		  
As of December 31, 2016   $313  
Revaluation of warrants     (275 )
Exercise warrants (see note 7(b))    

(*)

  
As of June 30, 2017   $ 38