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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
FAIR VALUE MEASUREMENTS    
Summary of the levels of the fair value hierarchy into which the Company's financial assets and liabilities falls

The following tables summarize the levels of the fair value hierarchy into which the Company's financial assets and liabilities fall as of September 30, 2014:

Financial assets:
  Total   Level 1   Level 2   Level 3  

Included in cash and cash equivalents

                          

Government securities money market

   $ 63,987   $ —   $ 63,987   $ —  

Investments

                          

U.S. treasury bills

     73,999     —     73,999     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total financial assets

   $ 137,986   $ —   $ 137,986   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

        The following table summarizes the levels of the fair value hierarchy into which the Company's financial assets fall as of December 31, 2013:

Financial assets:
  Total   Level 1   Level 2   Level 3  

Included in cash and cash equivalents

                          

Government securities money market

   $ 73,366   $ —   $ 73,366   $ —  

U.S. treasury bills

     146,991     —     146,991     —  

Bank time deposits

     40,468     —     40,468     —  

Investments

                          

U.S. treasury bills

     66,237     —     66,237     —  

Common stock

     1,904     —     —     1,904  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total financial assets

   $ 328,966   $ —   $ 327,062   $ 1,904  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

  The following tables summarize the levels of the fair value hierarchy into which the Company's financial assets and liabilities fall as of December 31, 2013:

Financial assets:
  Total   Level 1   Level 2   Level 3  

Included in cash and cash equivalents

                          

Government securities money market

   $ 73,366   $ —   $ 73,366   $ —  

U.S. treasury bills

     146,991     —     146,991     —  

Bank time deposits

     40,468     —     40,468     —  

Investments:

                          

U.S. treasury bills

     66,237     —     66,237     —  

Common stock

     1,904     —     —     1,904  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total investments in securities

     68,141     —     66,237     1,904  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total financial assets

   $ 328,966   $ —   $ 327,062   $ 1,904  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

        The following table summarizes the levels of the fair value hierarchy into which the Company's financial assets fall as of December 31, 2012:

Financial assets:
  Total   Level 1   Level 2   Level 3  

Included in cash and cash equivalents

                          

Government securities money market

   $ 22,685   $ —   $ 22,685   $ —  

U.S. treasury bills

     135,293     135,293     —     —  

Investments:

                          

U.S. treasury bills

     50,995     50,995     —     —  

Bank time deposits

     88,143     —     88,143     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total investments in securities

     139,138     50,995     88,143     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total financial assets

   $ 297,116   $ 186,288   $ 110,828   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of changes to the Company's investment classified as Level 3
  Common Stock  

January 1, 2014

   $ 1,904  

Non-cash settlement of customer receivable

     1,000  

Distribution to Parent

     (2,904 )
       
​ ​ ​ ​ ​

September 30, 2014

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

Unrealized gains (losses) related to investment still held as of September 30, 2014

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

 

 
   Common
Stock		  

January 1, 2013

   $ —  

Non-cash settlement of accounts receivable

     2,828  

Unrealized gains (losses)

     (924 )
       
​ ​ ​ ​ ​

December 31, 2013

   $ 1,904  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​
       

Unrealized gains (losses) related to investment still held as of December 31, 2013

   $ (924 )
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​