Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Measurements
Short-term investments (money market funds, U.S. Government Securities and Agency Investments)	$ 318,710	$ 246,571
Recurring | Estimate of fair value measurement
Fair Value Measurements
Total	432,677
Recurring | Money market funds, U.S. Government Securities and Agency Investments | Estimate of fair value measurement
Fair Value Measurements
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	114,475	136,771
Total		382,018
Recurring | U.S. Government Securities and Agency Investments | Estimate of fair value measurement
Fair Value Measurements
Short-term investments (money market funds, U.S. Government Securities and Agency Investments)	318,202	245,247
Recurring | Level 1
Fair Value Measurements
Total	432,677
Recurring | Level 1 | Money market funds, U.S. Government Securities and Agency Investments
Fair Value Measurements
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	114,475	111,771
Total		357,018
Recurring | Level 1 | U.S. Government Securities and Agency Investments
Fair Value Measurements
Short-term investments (money market funds, U.S. Government Securities and Agency Investments)	$ 318,202	245,247
Recurring | Level 2 | Money market funds, U.S. Government Securities and Agency Investments
Fair Value Measurements
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)		25,000
Total		$ 25,000