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Assets - Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Total available-for-sale securities      
Amortized Cost $ 186,151   $ 189,791
Gross Unrealized Gains 28   15
Gross Unrealized Losses (37)   (35)
Estimated Fair Value 186,142   189,771
Available-for-sale securities in a loss position      
Estimated Fair Value 55,493   52,545
Gross Unrealized Losses (37)   (35)
Investments that had been in a continuous loss position for more than 12 months 0   0
Realized gains or losses      
Realized gains 0    
Realized losses   $ 0  
Contractual maturities - Amortized Cost      
Amortized Cost, Due in one year or less 154,211    
Amortized Cost, Due after one year through two years 28,965    
Amortized Cost, Due after two years through three years 2,975    
Amortized Cost 186,151   189,791
Contractual maturities - Estimated Fair Value      
Estimated Fair Value, Due in one year or less 154,214    
Estimated Fair Value, Due after one year through two years 28,952    
Estimated Fair Value, Due after two years through three years 2,976    
Available-for-sale Securities, Debt Securities, Total 186,142   189,771
U.S. treasuries      
Total available-for-sale securities      
Amortized Cost 120,077   149,206
Gross Unrealized Gains 20   14
Gross Unrealized Losses (1)   (1)
Estimated Fair Value 120,096   149,219
Available-for-sale securities in a loss position      
Estimated Fair Value 7,522   19,991
Gross Unrealized Losses (1)   (1)
Contractual maturities - Amortized Cost      
Amortized Cost 120,077   149,206
Contractual maturities - Estimated Fair Value      
Available-for-sale Securities, Debt Securities, Total 120,096   149,219
Corporate debt      
Total available-for-sale securities      
Amortized Cost 58,478   32,588
Gross Unrealized Gains 7    
Gross Unrealized Losses (36)   (34)
Estimated Fair Value 58,449   32,554
Available-for-sale securities in a loss position      
Estimated Fair Value 47,971   32,554
Gross Unrealized Losses (36)   (34)
Contractual maturities - Amortized Cost      
Amortized Cost 58,478   32,588
Contractual maturities - Estimated Fair Value      
Available-for-sale Securities, Debt Securities, Total 58,449   32,554
Commercial paper      
Total available-for-sale securities      
Amortized Cost 7,596   7,997
Gross Unrealized Gains 1   1
Estimated Fair Value 7,597   7,998
Contractual maturities - Amortized Cost      
Amortized Cost 7,596   7,997
Contractual maturities - Estimated Fair Value      
Available-for-sale Securities, Debt Securities, Total $ 7,597   $ 7,998