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FAIR VALUE MEASUREMENTS - SECURITIES WITH UNREALIZED LOSSES (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value   $ 46,277
Less Than 12 Months - Gross Unrealized Losses   (25)
Total - Estimated Fair Value   46,277
Total - Gross Unrealized Losses   (25)
Commercial paper (due in less than one year)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value   8,571
Less Than 12 Months - Gross Unrealized Losses   (3)
Total - Estimated Fair Value   8,571
Total - Gross Unrealized Losses   (3)
Corporate notes (due in less than one year)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value $ 49,835 26,082
Less Than 12 Months - Gross Unrealized Losses (229) (13)
Total - Estimated Fair Value 49,835 26,082
Total - Gross Unrealized Losses $ (229) (13)
Corporate notes (due in one to two years)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value   11,624
Less Than 12 Months - Gross Unrealized Losses   (9)
Total - Estimated Fair Value   11,624
Total - Gross Unrealized Losses   $ (9)