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CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - SUMMARY (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Gross Unrealized Losses    
Cash and cash equivalents gross unrealized losses   $ (2)
Total cash, cash equivalents and short-term investments, Gross Unrealized Losses $ (5) (19)
Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 126,884 117,711
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and short-term investments 128,094 177,439
Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 126,884 117,709
Fair Value    
Total cash, cash equivalents and short-term investments 128,089 177,420
Corporate debt securities and commercial paper    
Amortized Cost    
Total maturing within 1 year 1,210 59,728
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (5) (17)
Fair Value    
Total maturing within 1 year and included in short-term investments 1,205 59,711
Corporate debt securities    
Amortized Cost    
Total short-term investments, Amortized Cost 1,210 59,728
Gross Unrealized Losses    
Total short-term investments, Gross Unrealized Losses (5) (17)
Fair Value    
Total short-term investments, Fair Value 1,205 59,711
Cash | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 103,119 87,845
Cash | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 103,119 87,845
Money market funds | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 95 532
Money market funds | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 95 532
Commercial paper | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 23,670  
Commercial paper | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents $ 23,670  
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   29,334
Corporate debt securities and commercial paper | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents   $ 29,332