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CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - SUMMARY (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Gross Unrealized Gains    
Total short-term investments, Gross Unrealized Gains   $ 0
Total cash, cash equivalents and short-term investments, Gross Unrealized Gains   0
Gross Unrealized Losses    
Cash and cash equivalents gross unrealized losses   (2)
Total short-term investments, Gross Unrealized Losses $ (4) (17)
Total cash, cash equivalents and short-term investments, Gross Unrealized Losses (4) (19)
Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 187,810 117,711
Amortized Cost    
Total short-term investments, Amortized Cost 6,706 59,728
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and short-term investments 194,516 177,439
Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 187,810 117,709
Fair Value    
Total short-term investments, Fair Value 6,702 59,711
Total cash, cash equivalents and short-term investments 194,512 177,420
Corporate debt securities and commercial paper    
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities   (17)
Corporate debt securities and commercial paper | Amortized Cost    
Amortized Cost    
Total maturing within 1 year   59,728
Corporate debt securities and commercial paper | Fair Value    
Fair Value    
Total maturing within 1 year and included in short-term investments   59,711
Corporate debt securities    
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (4)  
Corporate debt securities | Amortized Cost    
Amortized Cost    
Total maturing within 1 year 6,706  
Corporate debt securities | Fair Value    
Fair Value    
Total maturing within 1 year and included in short-term investments 6,702  
Federal Home Loan Banks    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 9,600  
Cash | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 169,730 87,845
Cash | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 169,730 87,845
Money market funds | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 85 532
Money market funds | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 85 532
Commercial paper | Amortized Cost    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents 17,995  
Commercial paper | Fair Value    
Cash, cash equivalents and short-term investments    
Cash and cash equivalents $ 17,995  
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