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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Measurements  
Schedule of the Company's assets and liabilities that are measured at fair value on recurring basis

The following table presents, for each of the fair value hierarchy levels required under ASC 820, the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2013:

 
   Fair Value Measurement Using  
 
   Quoted prices in
active markets for
identical assets
(Level 1)		   Significant other
observable inputs
(Level 2)		   Significant
unobservable
inputs
(Level 3)		  

Assets

                    

Investments in U.S. Treasury money market funds*

   $ 203,828   $ —   $ —  

Liabilities

                    

Series A Warrant Liability

   $ —   $ —   $ —  

Series B Warrant Liabilty

   $ —   $ —   $ —  
*
Investments in U.S. Treasury money market funds are reflected in cash and cash equivalents in the accompanying Balance Sheets.

        The following table presents, for each of the fair value hierarchy levels required under ASC 820, the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2012:

 
   Fair Value Measurement Using  
 
   Quoted prices in
active markets for
identical assets
(Level 1)		   Significant other
observable inputs
(Level 2)		   Significant
unobservable
inputs
(Level 3)		  

Assets

                    

Investments in money market funds*

   $ 524   $ —   $ —  

Liabilities

                    

Series A Warrant Liability

   $ —   $ —   $ 523  

Series B Warrant Liabilty

   $ —   $ —   $ 443  
*
Investments in money markets are reflected in cash and cash equivalents in the accompanying Balance Sheets.
Summary of changes in fair value of the Company's Level 3 valuation for the Series A and Series B warrant liabilities

 

 
   Level 3  
 
   Series A
Warrant Liability		   Series B
Warrant Liability		  

Balance at December 31, 2011

   $ 193   $ —  

Warrants issued in connection with venture debt facility

     —     407  

Change in fair value of warrant liability

     330     36  
           
​ ​ ​ ​ ​ ​ ​ ​

Balance at December 31, 2012

     523     443  

Warrants issued in connection with venture debt facility

     —     32  

Change in fair value of warrant liability

     379     802  

Conversion of warrant liability to equity

     (902 )   (1,277 )
           
​ ​ ​ ​ ​ ​ ​ ​

Balance at December 31, 2013

   $ —   $ —  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​