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FAIR VALUE MEASUREMENTS - SECURITIES WITH UNREALIZED LOSSES (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value $ 72,445 $ 56,850
Less Than 12 Months - Gross Unrealized Losses (38) (33)
Total - Estimated Fair Value 72,445 56,850
Total - Gross Unrealized Losses (38) (33)
Municipal securities (due in one to two years)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 2,999  
Less Than 12 Months - Gross Unrealized Losses (1)  
Total - Estimated Fair Value 2,999  
Total - Gross Unrealized Losses (1)  
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 4,997 4,999
Less Than 12 Months - Gross Unrealized Losses (3) (1)
Total - Estimated Fair Value 4,997 4,999
Total - Gross Unrealized Losses (3) (1)
Commercial paper (due in less than one year)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 31,965 22,956
Less Than 12 Months - Gross Unrealized Losses (10) (8)
Total - Estimated Fair Value 31,965 22,956
Total - Gross Unrealized Losses (10) (8)
Corporate notes (due in less than one year)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 17,252 12,573
Less Than 12 Months - Gross Unrealized Losses (8) (7)
Total - Estimated Fair Value 17,252 12,573
Total - Gross Unrealized Losses (8) (7)
Corporate notes (due in one to two years)    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months - Estimated Fair Value 15,232 16,322
Less Than 12 Months - Gross Unrealized Losses (16) (17)
Total - Estimated Fair Value 15,232 16,322
Total - Gross Unrealized Losses $ (16) $ (17)