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Debt (Tables)
 6 Months Ended
Jun. 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 June 30, 2015 and December 31, 2014 were as follows:

 

    At June 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

     (294 )      (18 ) 
 

 

 

    

 

 

  

Carrying amount

   $ 6,706      $ 39,703   
 

 

 

    

 

 

  
Summary of Debt Discount Activity

Debt discount activity during the six months ended June 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 )      (6 )      (410 ) 

Extinguishment upon conversion of debt

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

 

 

    

 

 

    

 

 

    

 

 

  

Balance at June 30, 2015

   $ —        $ —        $ 294      $ 294   
 

 

 

    

 

 

    

 

 

    

 

 

  
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