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CASH, CASH EQUIVALENTS, SHORT-TERM INVESTMENTS AND MARKETABLE SECURITIES, LONG-TERM - SUMMARY (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Amortized Cost    
Marketable securities    
Cash and cash equivalents $ 87,821 $ 101,084
Amortized Cost    
Total available-for-sale securities, Amortized Cost 31,107 108,717
Gross Unrealized Gains    
Gross Unrealized Gains    
Total available-for-sale securities, Gross Unrealized Gains 6 1
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains 6 1
Gross Unrealized Losses    
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses (4) (34)
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (4) (34)
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and marketable securities 118,928 209,801
Fair Value    
Marketable securities    
Cash and cash equivalents 87,821 101,084
Fair Value    
Total available-for-sale securities, Fair Value 31,109 108,684
Total cash, cash equivalents and marketable securities 118,930 209,768
Corporate debt securities | Amortized Cost    
Amortized Cost    
Total maturing within 1 year 29,922 108,717
Total maturing between 1 and 2 years 1,185  
Corporate debt securities | Gross Unrealized Gains    
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 6 1
Corporate debt securities | Gross Unrealized Losses    
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (3) (34)
Total maturing between 1 and 2 years and included in marketable securities (1)  
Corporate debt securities | Fair Value    
Fair Value    
Total maturing within 1 year and included in marketable securities 29,925 108,684
Total maturing between 1 and 2 years and included in marketable securities 1,184  
Cash | Amortized Cost    
Marketable securities    
Cash and cash equivalents 74,567 65,600
Cash | Fair Value    
Marketable securities    
Cash and cash equivalents 74,567 65,600
Money market funds | Amortized Cost    
Marketable securities    
Cash and cash equivalents 33 64
Money market funds | Fair Value    
Marketable securities    
Cash and cash equivalents 33 64
Corporate Securities And Commercial paper | Amortized Cost    
Marketable securities    
Cash and cash equivalents 13,221 35,420
Corporate Securities And Commercial paper | Fair Value    
Marketable securities    
Cash and cash equivalents $ 13,221 $ 35,420