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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Amortized Cost    
Total available-for-sale securities, Amortized Cost $ 67,007 $ 77,751
Gross Unrealized Gains    
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains 14 4
Total available-for-sale securities, Gross Unrealized Gains 14 1
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses (10) (18)
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (10) (20)
Fair Value    
Increase in cash and cash equivalents and marketable securities 107,000  
Amortized Cost    
Available-for-sale securities:    
Cash and cash equivalents 107,500 488,667
Gross Unrealized Gains    
Available-for-sale securities:    
Cash and cash equivalents   3
Gross Unrealized Losses    
Available-for-sale securities:    
Cash and cash equivalents   (2)
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and marketable securities 174,507 566,418
Fair Value    
Available-for-sale securities:    
Cash and cash equivalents 107,500 488,668
Fair Value    
Total available-for-sale securities, Fair Value 67,011 77,734
Total cash, cash equivalents and marketable securities 174,511 566,402
Corporate debt securities    
Amortized Cost    
Total maturing within 1 year and included in marketable securities 48,823 70,777
Total maturing between 1 and 2 years and included in marketable securities 2,025 6,974
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 6 1
Total maturing between 1 and 2 years and included in marketable securities 2  
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (10) (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   70,773
Total maturing between 1 and 2 years and included in marketable securities   6,961
Corporate debt securities | Fair Value    
Fair Value    
Total maturing within 1 year and included in marketable securities 48,819  
Total maturing between 1 and 2 years and included in marketable securities 2,027  
U.S. Treasury securities    
Amortized Cost    
Total maturing within 1 year and included in marketable securities 16,159  
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 6  
U.S. Treasury securities | Fair Value    
Fair Value    
Total maturing within 1 year and included in marketable securities 16,165  
Cash | Amortized Cost    
Available-for-sale securities:    
Cash and cash equivalents 55,434 22,452
Cash | Fair Value    
Available-for-sale securities:    
Cash and cash equivalents 55,434 22,452
Money market funds | Amortized Cost    
Available-for-sale securities:    
Cash and cash equivalents 4,411 179,923
Money market funds | Fair Value    
Available-for-sale securities:    
Cash and cash equivalents 4,411 179,923
Corporate Securities And Commercial Paper | Amortized Cost    
Available-for-sale securities:    
Cash and cash equivalents 47,655  
Corporate Securities And Commercial Paper | Fair Value    
Available-for-sale securities:    
Cash and cash equivalents $ 47,655  
Corporate debt securities | Amortized Cost    
Available-for-sale securities:    
Cash and cash equivalents   286,292
Corporate debt securities | Gross Unrealized Gains    
Available-for-sale securities:    
Cash and cash equivalents   3
Corporate debt securities | Gross Unrealized Losses    
Available-for-sale securities:    
Cash and cash equivalents   (2)
Corporate debt securities | Fair Value    
Available-for-sale securities:    
Cash and cash equivalents   $ 286,293