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Available-for-Sale Securities (Tables)
12 Months Ended
Dec. 31, 2016
Available-for-Sale Securities  
Summary of available-for-sale securities

        As of December 31, 2015, the Company held no available-for-sale securities. The following table summarizes the available-for-sale securities held at December 31, 2016 (in thousands):

                                                                                                                                                                                    

 

 

Amortized Cost

 

Gross Unrealized
Gains

 

Gross Unrealized
Losses

 

Fair Value

 

December 31, 2016

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate debt securities

 

$

13,934 

 

$

 

$

 

(4)

$

13,930 

 

U.S. government-sponsored securities

 

 

1,001 

 

 

 

 

 

 

1,001 

 

​  

​  

​  

​  

​  

​  

​  

​  

Total

 

$

14,935 

 

$

 

$

 

(4)

$

14,931 

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

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​