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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2013
MARKETABLE SECURITIES  
Summary of securities classified as cash and cash equivalents and available-for-sale marketable securities

 Securities classified as cash and cash equivalents and available-for-sale marketable securities as of December 31, 2013 and 2012 are summarized below (in thousands).

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

Cash and cash equivalents:

                          

Cash

   $ 26,728   $ —   $ —   $ 26,728  

Money market funds

     217,946     —     —     217,946  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and cash equivalents

   $ 244,674   $ —   $ —   $ 244,674  

Available-for-sale securities:

                          

Total maturing within 1 year and included in marketable securities:

                          

Corporate debt securities

   $ 12,440   $ 8   $ (2 ) $ 12,446  

Government agency debt securities

     14,814     3     —     14,817  

Total maturing between 1 and 2 years and included in marketable securities:

                          

Corporate debt securities

     4,075     5     —     4,080  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total available-for-sale securities

   $ 31,329   $ 16   $ (2 ) $ 31,343  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash, cash equivalents and marketable securities

   $ 276,003   $ 16   $ (2 ) $ 276,017  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

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

Cash and cash equivalents:

                          

Cash

   $ 11,769   $ —   $ —   $ 11,769  

Money market funds

     11,268     —     —     11,268  

U.S. corporate debt securities

     6,039     —     —     6,039  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and cash equivalents

   $ 29,076   $ —   $ —   $ 29,076  

Available-for-sale securities:

                          

Total maturing within 1 year and included in marketable securities:

                          

Corporate debt securities

   $ 21,662   $ 31   $ —   $ 21,693  

U.S. government agency debt securities

     14,027     8     —     14,035  

U.S. Treasury securities

     2,008     1     —     2,009  

Total maturing between 1 and 2 years and included in marketable securities:

                          

Corporate debt securities

     7,858     7     (2 )   7,863  

U.S. government agency debt securities

     3,208     8     —     3,216  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total available-for-sale securities

   $ 48,763   $ 55   $ (2 ) $ 48,816  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash, cash equivalents and marketable securities

   $ 77,839   $ 55   $ (2 ) $ 77,892  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of the gross unrealized losses and fair value of investments

The following table shows the gross unrealized losses and fair value of the Company's investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2013 (in thousands):

 
   Less Than 12 Months   12 Months or Greater   Total  
 
   Fair Value   Gross
Unrealized
Losses		   Fair Value   Gross
Unrealized
Losses		   Fair Value   Gross
Unrealized
Losses		  

Corporate debt securities

   $ 3,438   $ (2 ) $ —   $ —   $ 3,438   $ (2 )
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total available-for-sale

   $ 3,438   $ (2 ) $ —   $ —   $ 3,438   $ (2 )
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           
Schedule of fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis

The following table represents the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 (in thousands):

 
   Level 1   Level 2   Level 3   Total  

Money market funds

   $ 217,946   $ —   $ —   $ 217,946  

Corporate debt securities

     —     16,526     —     16,526  

Government agency debt securities

     —     14,817     —     14,817  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 217,946   $ 31,343   $ —   $ 249,289  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Liabilities:

                          

Contingent consideration—Zipsor

   $ —   $ —   $ 1,638   $ 1,638  

Contingent consideration—Lazanda

     —     —     8,616     8,616  

Contingent consideration—CAMBIA

     —     —     1,010     1,010  

Unfavorable contract assumed

     —     —     3,540     3,540  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ —   $ —   $ 14,804   $ 14,804  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

The following table represents the Company's fair value hierarchy for its financial assets measured at fair value on a recurring basis as of December 31, 2012 (in thousands):

 
   Level 1   Level 2   Level 3   Total  

Money market funds

   $ 11,268   $ —   $ —   $ 11,268  

Corporate debt securities

     6,039     29,556     —     35,595  

Government agency debt securities

     —     17,251     —     17,251  

U.S. Treasury securities

     —     2,009     —     2,009  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 17,307   $ 48,816   $ —   $ 66,123  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Liabilities:

                          

Contingent consideration—Zipsor

   $ —   $ —   $ 1,342   $ 1,342  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ —   $ —   $ 1,342   $ 1,342  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Summary of the changes in fair value of all financial liabilities measured at fair value on a recurring basis using significant unobservable inputs

The table below provides a summary of the changes in fair value of all financial liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2013 (in thousands):

 
   Balance at
December 31,
2012		   Acquisitions
2013		   Changes
in
Fair Value		   Balance at
December 31,
2013		  

Liabilities:

                          

Contingent consideration obligations—Zipsor

   $ 1,342   $ —   $ 296   $ 1,638  

Contingent consideration obligations—Lazanda

     —     8,004     612     8,616  

Contingent consideration obligations—CAMBIA

     —     1,010     —     1,010  

Unfavorable contract assumed

     —     3,540     —     3,540  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 1,342   $ 12,554   $ 908   $ 14,804  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​