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FAIR VALUE MEASUREMENTS - SECURITIES WITH UNREALIZED LOSSES (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value $ 69,097 $ 56,850
Less Than 12 Months - Gross Unrealized Losses (34) (33)
Total - Estimated Fair Value 69,097 56,850
Total - Gross Unrealized Losses (34) (33)
Government-sponsored enterprise securities (due in one to two years)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 4,999 4,999
Less Than 12 Months - Gross Unrealized Losses (1) (1)
Total - Estimated Fair Value 4,999 4,999
Total - Gross Unrealized Losses (1) (1)
Commercial paper (due in less than one year)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 21,987 22,956
Less Than 12 Months - Gross Unrealized Losses (2) (8)
Total - Estimated Fair Value 21,987 22,956
Total - Gross Unrealized Losses (2) (8)
Corporate notes (due in less than one year)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 29,540 12,573
Less Than 12 Months - Gross Unrealized Losses (11) (7)
Total - Estimated Fair Value 29,540 12,573
Total - Gross Unrealized Losses (11) (7)
Corporate notes (due in one to two years)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 12,571 16,322
Less Than 12 Months - Gross Unrealized Losses (20) (17)
Total - Estimated Fair Value 12,571 16,322
Total - Gross Unrealized Losses $ (20) $ (17)