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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Amortized Cost    
Total available-for-sale securities, Amortized Cost $ 12,551 $ 31,329
Gross Unrealized Gains    
Total available-for-sale securities, Gross Unrealized Gains 8 16
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains 8 16
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses (5) (2)
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (5) (2)
Amortized Cost
   
Marketable securities    
Cash and cash equivalents 211,145 244,674
Amortized Cost
   
Fair Value    
Total cash, cash equivalents and marketable securities 223,696 276,003
Fair Value
   
Marketable securities    
Cash and cash equivalents 211,145 244,674
Fair Value    
Total available-for-sale securities, Fair Value 12,554 31,343
Total cash, cash equivalents and marketable securities 223,699 276,017
Corporate debt securities
   
Amortized Cost    
Total maturing within 1 year and included in marketable securities 6,886 12,440
Total maturing between 1 and 2 years and included in marketable securities 5,665 4,075
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 7 8
Total maturing between 1 and 2 years and included in marketable securities 1 5
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities   (2)
Total maturing between 1 and 2 years and included in marketable securities (5)  
Fair Value    
Total maturing within 1 year and included in marketable securities 6,893 12,446
Total maturing between 1 and 2 years and included in marketable securities 5,661 4,080
Government agency debt securities
   
Amortized Cost    
Total maturing within 1 year and included in marketable securities   14,814
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities   3
Fair Value    
Total maturing within 1 year and included in marketable securities   14,817
Cash | Amortized Cost
   
Marketable securities    
Cash and cash equivalents 29,891 26,728
Cash | Fair Value
   
Marketable securities    
Cash and cash equivalents 29,891 26,728
Money market funds | Amortized Cost
   
Marketable securities    
Cash and cash equivalents 181,254 217,946
Money market funds | Fair Value
   
Marketable securities    
Cash and cash equivalents $ 181,254 $ 217,946