Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring Basis - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Quoted prices in active markets for identical assets (Level 1) | Investments in money market funds
Fair Value Measurements
Investments in money market funds	$ 475,689	$ 251,488
Quoted prices in active markets for identical assets (Level 1) | Investments in U.S. Treasury securities
Fair Value Measurements
Investments, fair value disclosure	27,423	18,185
Quoted prices in active markets for identical assets (Level 1) | Investments in corporate debt securities
Fair Value Measurements
Investments, fair value disclosure	0	0
Quoted prices in active markets for identical assets (Level 1) | Investments in U.S. government agency securities
Fair Value Measurements
Investments, fair value disclosure	0
Quoted prices in active markets for identical assets (Level 1) | Investments in asset-backed securities
Fair Value Measurements
Investments, fair value disclosure	0	0
Quoted prices in active markets for identical assets (Level 1) | Investments in supranational securities
Fair Value Measurements
Investments, fair value disclosure	0	0
Significant other observable inputs (Level 2) | Investments in money market funds
Fair Value Measurements
Investments in money market funds	0	0
Significant other observable inputs (Level 2) | Investments in U.S. Treasury securities
Fair Value Measurements
Investments, fair value disclosure	0	0
Significant other observable inputs (Level 2) | Investments in corporate debt securities
Fair Value Measurements
Investments, fair value disclosure	109,129	82,081
Significant other observable inputs (Level 2) | Investments in U.S. government agency securities
Fair Value Measurements
Investments, fair value disclosure	9,669
Significant other observable inputs (Level 2) | Investments in asset-backed securities
Fair Value Measurements
Investments, fair value disclosure	19,297	15,995
Significant other observable inputs (Level 2) | Investments in supranational securities
Fair Value Measurements
Investments, fair value disclosure	5,013	4,041
Significant unobservable inputs (Level 3) | Investments in money market funds
Fair Value Measurements
Investments in money market funds	0	0
Significant unobservable inputs (Level 3) | Investments in U.S. Treasury securities
Fair Value Measurements
Investments, fair value disclosure	0	0
Significant unobservable inputs (Level 3) | Investments in corporate debt securities
Fair Value Measurements
Investments, fair value disclosure	0	0
Significant unobservable inputs (Level 3) | Investments in U.S. government agency securities
Fair Value Measurements
Investments, fair value disclosure	0
Significant unobservable inputs (Level 3) | Investments in asset-backed securities
Fair Value Measurements
Investments, fair value disclosure	0	0
Significant unobservable inputs (Level 3) | Investments in supranational securities
Fair Value Measurements
Investments, fair value disclosure	$ 0	$ 0