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Debt (Tables)
 9 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]  
Summary of Carrying Amount

The carrying amounts of the Company’s Notes, including the 5X conversion liability, and the Term Loan as of September 30, 2015 and December 31, 2014 were as follows:

 

     At September 30, 2015      At December 31, 2014  

Outstanding principal:

      

Notes, including 5X Notes

    $  —         $ 29,088   

Term Loan

      7,000         —     

5X conversion liability

      —           10,633   

Debt discount

      (274 )       (18 ) 
  

 

 

     

 

 

  

Carrying amount

    $ 6,726       $ 39,703   
  

 

 

     

 

 

  
Summary of Debt Discount Activity

Debt discount activity during the nine months ended September 30, 2015 was as follows:

 

     Notes, including
5X Notes		      2015 Bridge Notes      Term Loan      Total  

Balance at December 31, 2014

    $ 18       $  —         $  —         $ 18   

Discount on debt issued during the period

      —           1,547         300         1,847   

Amortization of debt discount

      (18 )       (386 )       (26 )       (430 ) 

Extinguishment upon conversion of debt

      —           (1,161 )       —           (1,161 ) 
  

 

 

     

 

 

     

 

 

     

 

 

  

Balance at September 30, 2015

    $  —         $  —         $ 274       $ 274   
  

 

 

     

 

 

     

 

 

     

 

 

  
Schedule of Future Principle Payments

Future principal payments in connection with the Term Loan are as follows:

 

Remainder of 2015

    $ —     

2016

      1,049   

2017

      2,701   

2018

      3,250   
  

 

 

  
   $ 7,000