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MARKETABLE SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Amortized Cost    
Total available-for-sale securities, Amortized Cost $ 31,329 $ 48,763
Gross Unrealized Gains    
Total available-for-sale securities, Gross Unrealized Gains 16 55
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains 16 55
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses (2) (2)
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (2) (2)
Amortized Cost
   
Marketable securities    
Cash and cash equivalents 244,674 29,076
Amortized Cost
   
Fair Value    
Total cash, cash equivalents and marketable securities 276,003 77,839
Fair Value
   
Marketable securities    
Cash and cash equivalents 244,674 29,076
Fair Value    
Total available-for-sale securities, Fair Value 31,343 48,816
Total cash, cash equivalents and marketable securities 276,017 77,892
Corporate debt securities
   
Amortized Cost    
Total maturing within 1 year and included in marketable securities 12,440 21,662
Total maturing between 1 and 2 years and included in marketable securities 4,075 7,858
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 8 31
Total maturing between 1 and 2 years and included in marketable securities 5 7
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   (2)
Fair Value    
Total maturing within 1 year and included in marketable securities 12,446 21,693
Total maturing between 1 and 2 years and included in marketable securities 4,080 7,863
U.S. government agency debt securities
   
Amortized Cost    
Total maturing within 1 year and included in marketable securities 14,814 14,027
Total maturing between 1 and 2 years and included in marketable securities   3,208
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 3 8
Total maturing between 1 and 2 years and included in marketable securities   8
Fair Value    
Total maturing within 1 year and included in marketable securities 14,817 14,035
Total maturing between 1 and 2 years and included in marketable securities   3,216
U.S. Treasury securities
   
Amortized Cost    
Total maturing within 1 year and included in marketable securities   2,008
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities   1
Fair Value    
Total maturing within 1 year and included in marketable securities   2,009
Cash | Amortized Cost
   
Marketable securities    
Cash and cash equivalents 26,728 11,769
Cash | Fair Value
   
Marketable securities    
Cash and cash equivalents 26,728 11,769
Money market funds | Amortized Cost
   
Marketable securities    
Cash and cash equivalents 217,946 11,268
Money market funds | Fair Value
   
Marketable securities    
Cash and cash equivalents 217,946 11,268
Corporate debt securities | Amortized Cost
   
Marketable securities    
Cash and cash equivalents   6,039
Corporate debt securities | Fair Value
   
Marketable securities    
Cash and cash equivalents   $ 6,039