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Cash, Cash Equivalents and Marketable Securities
 12 Months Ended
Dec. 31, 2013
Cash, Cash Equivalents and Marketable Securities  
Cash, Cash Equivalents and Marketable Securities

5. Cash, Cash Equivalents and Marketable Securities

        The following tables summarize the Company's cash, cash equivalents and marketable securities as of December 31, 2013 and December 31, 2012 (in thousands):

December 31, 2013
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value  

Cash and money market funds

   $ 18,078   $ —   $ —   $ 18,078  

Corporate debt securities

                          

Due in one year or less

     22,631     11     (2 )   22,640  

Due in two years or less

     3,708     2     (1 )   3,709  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 44,417   $ 13   $ (3 ) $ 44,427  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Reported as:

                          

Cash and cash equivalents

   $ 18,078   $ —   $ —   $ 18,078  

Short-term investments

     26,339     13     (3 )   26,349  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 44,417   $ 13   $ (3 ) $ 44,427  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

December 31, 2012
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value  

Cash and money market funds

   $ 14,776   $ —   $ —   $ 14,776  

Corporate debt securities

                          

Due in one year or less

     5,754     2     (1 )   5,755  

Due in two years or less

     10,867     3     (10 )   10,860  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 31,397   $ 5   $ (11 ) $ 31,391  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Reported as:

                          

Cash and cash equivalents

   $ 14,776   $ —   $ —   $ 14,776  

Short-term investments

     16,621     5     (11 )   16,615  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 31,397   $ 5   $ (11 ) $ 31,391  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

        At December 31, 2013 and 2012 we held eight and fifteen debt securities that had been in an unrealized loss position for less than 12 months, respectively. We held no investments that have been in a continuous unrealized loss position for 12 months or longer. The aggregate fair value of these securities was $9.5 million and $11.6 million at December 31, 2013 and 2012, respectively. We evaluated our securities for other-than-temporary impairments based on quantitative and qualitative factors. We considered the decline in market value for the eight securities as of December 31, 2013 to be primarily attributable to current economic and market conditions. It is not more likely than not that we will be required to sell these securities. Three of these securities were sold in January 2014 for an immaterial realized gain, the remaining five securities we do not intend to sell before the recovery of their amortized cost bases, which recovery is expected within the next 12 months. Based on our analysis, we do not consider these investments to be other-than-temporarily impaired as of December 31, 2013 or 2012.

        As of December 31, 2013, we held $11.7 million in financial institution debt securities and other corporate debt securities located in Canada, the United Kingdom, the Netherlands, Australia, and Norway. As of December 31, 2012, we held $7.6 million in financial institution debt securities and other corporate debt securities located in Canada, the United Kingdom, the Netherlands, and Australia. Based on our analysis, we do not consider these investments to be other-than-temporarily impaired as of December 31, 2013 or 2012.

        We had no realized gains or losses or other-than-temporary impairments on our short-term investments for the years ended December 31, 2013 and 2012, the period from April 5, 2011 (inception) through December 31, 2011 and the period from April 5, 2011 (inception) through December 31, 2013.