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CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - SUMMARY (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Gross Unrealized Losses    
Cash and cash equivalents gross unrealized losses   $ (2)
Total short-term investments, Gross Unrealized Losses $ (1) (17)
Total cash, cash equivalents and short-term investments, Gross Unrealized Losses (1) (19)
Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 107,585 117,711
Amortized Cost    
Total short-term investments, Amortized Cost 5,873 59,728
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and short-term investments 113,458 177,439
Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 107,585 117,709
Fair Value    
Total short-term investments, Fair Value 5,872 59,711
Total cash, cash equivalents and short-term investments 113,457 177,420
Corporate debt securities and commercial paper    
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (1) (17)
Corporate debt securities and commercial paper | Amortized Cost    
Amortized Cost    
Total maturing within 1 year 5,873 59,728
Corporate debt securities and commercial paper | Fair Value    
Fair Value    
Total maturing within 1 year and included in short-term investments 5,872 59,711
Cash | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 88,559 87,845
Cash | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 88,559 87,845
Money market funds | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 101 532
Money market funds | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 101 532
U.S. Treasury securities | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 3,605  
U.S. Treasury securities | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 3,605  
Corporate debt securities and commercial paper    
Gross Unrealized Losses    
Cash and cash equivalents gross unrealized losses   (2)
Corporate debt securities and commercial paper | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 15,320 29,334
Corporate debt securities and commercial paper | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents $ 15,320 $ 29,332