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MARKETABLE SECURITIES - SUMMARY (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Amortized Cost    
Total available-for-sale securities, Amortized Cost $ 108,717 $ 77,751
Gross Unrealized Gains    
Total available-for-sale securities, Gross Unrealized Gains 1 1
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains 1 4
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses (34) (18)
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (34) (20)
Amortized Cost    
Marketable securities    
Cash and cash equivalents 101,084 488,667
Gross Unrealized Gains    
Marketable securities    
Cash and cash equivalents   3
Gross Unrealized Losses    
Marketable securities    
Cash and cash equivalents   (2)
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and marketable securities 209,801 566,418
Fair Value    
Marketable securities    
Cash and cash equivalents 101,084 488,668
Fair Value    
Total available-for-sale securities, Fair Value 108,684 77,734
Total cash, cash equivalents and marketable securities 209,768 566,402
Corporate debt securities    
Amortized Cost    
Total maturing within 1 year and included in marketable securities 108,717 70,777
Total maturing between 1 and 2 years and included in marketable securities   6,974
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 1 1
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (34) (5)
Total maturing between 1 and 2 years and included in marketable securities   (13)
Fair Value    
Total maturing within 1 year and included in marketable securities 108,684 70,773
Total maturing between 1 and 2 years and included in marketable securities   6,961
Cash | Amortized Cost    
Marketable securities    
Cash and cash equivalents 65,600 22,452
Cash | Fair Value    
Marketable securities    
Cash and cash equivalents 65,600 22,452
Money market funds | Amortized Cost    
Marketable securities    
Cash and cash equivalents 64 179,923
Money market funds | Fair Value    
Marketable securities    
Cash and cash equivalents 64 179,923
Corporate Securities And Commercial Paper | Amortized Cost    
Marketable securities    
Cash and cash equivalents 35,420  
Corporate Securities And Commercial Paper | Fair Value    
Marketable securities    
Cash and cash equivalents $ 35,420  
Corporate debt securities | Amortized Cost    
Marketable securities    
Cash and cash equivalents   286,292
Corporate debt securities | Gross Unrealized Gains    
Marketable securities    
Cash and cash equivalents   3
Corporate debt securities | Gross Unrealized Losses    
Marketable securities    
Cash and cash equivalents   (2)
Corporate debt securities | Fair Value    
Marketable securities    
Cash and cash equivalents   $ 286,293