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Fair Value Measurements and Available for Sale Investments - Available-for-sale Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 382,555 $ 517,907
Gross Unrealized Gains 199 38
Gross Unrealized Losses (789) (5,077)
Total Fair Value 381,965 512,868
Short-term investments 354,939 369,933
Long-term investments 27,026 142,935
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 20,322 75,504
Gross Unrealized Gains 0 11
Gross Unrealized Losses (69) (913)
Total Fair Value 20,253 74,602
Short-term investments 20,300 57,100
Long-term investments $ 0 $ 17,500
Agency securities | Minimum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 1 year 1 year
Agency securities | Maximum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 2 years 2 years
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 246 $ 2,915
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2) (59)
Total Fair Value 244 2,856
Short-term investments 200 2,600
Long-term investments $ 0 $ 300
Certificates of deposit | Minimum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 1 year 1 year
Certificates of deposit | Maximum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 2 years 2 years
Commercial and corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 35,760 $ 61,791
Gross Unrealized Gains 77 8
Gross Unrealized Losses (83) (916)
Total Fair Value 35,754 60,883
Short-term investments 25,800 44,000
Long-term investments $ 10,000 $ 16,900
Commercial and corporate obligations | Minimum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 1 year 1 year
Commercial and corporate obligations | Maximum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 2 years 2 years
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 326,227 $ 377,697
Gross Unrealized Gains 122 19
Gross Unrealized Losses (635) (3,189)
Total Fair Value 325,714 374,527
Short-term investments 308,600 266,200
Long-term investments $ 17,100 $ 108,300
US Treasury Securities | Minimum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 1 year 1 year
US Treasury Securities | Maximum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity (in years) 2 years 2 years