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CASH, CASH EQUIVALENTS, SHORT-TERM INVESTMENTS AND MARKETABLE SECURITIES, LONG-TERM - SUMMARY (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Gross Unrealized Gains    
Total available-for-sale securities, Gross Unrealized Gains   $ 1
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains   1
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses $ (31) (34)
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (31) (34)
Amortized Cost    
Marketable securities    
Cash and cash equivalents 90,357 101,084
Amortized Cost    
Total available-for-sale securities, Amortized Cost 46,767 108,717
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and marketable securities 137,124 209,801
Fair Value    
Marketable securities    
Cash and cash equivalents 90,357 101,084
Fair Value    
Total available-for-sale securities, Fair Value 46,736 108,684
Total cash, cash equivalents and marketable securities 137,093 209,768
Corporate debt securities    
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities   1
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (26)  
Total maturing between 1 and 2 years and included in marketable securities (5)  
Total available-for-sale securities, Gross Unrealized Losses   (34)
Corporate debt securities | Amortized Cost    
Amortized Cost    
Total maturing within 1 year 45,580 108,717
Total maturing between 1 and 2 years 1,187  
Corporate debt securities | Fair Value    
Fair Value    
Total maturing within 1 year and included in marketable securities 45,554 108,684
Total maturing between 1 and 2 years and included in marketable securities 1,182  
Cash | Amortized Cost    
Marketable securities    
Cash and cash equivalents 62,656 65,600
Cash | Fair Value    
Marketable securities    
Cash and cash equivalents 62,656 65,600
Money market funds | Amortized Cost    
Marketable securities    
Cash and cash equivalents 109 64
Money market funds | Fair Value    
Marketable securities    
Cash and cash equivalents 109 64
Commercial paper | Amortized Cost    
Marketable securities    
Cash and cash equivalents 27,592  
Commercial paper | Fair Value    
Marketable securities    
Cash and cash equivalents $ 27,592  
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