FAIR VALUE MEASUREMENTS - Available-for-Sale Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Cash equivalents and short-term investments
Amortized Cost	$ 405,728	$ 281,252
Unrealized Gains	604	103
Fair Value	$ 406,332	$ 281,355
Fair value hierarchy - Level 1	us-gaap:FairValueInputsLevel1Member	us-gaap:FairValueInputsLevel1Member
Money market funds | Cash and cash equivalents
Cash equivalents and short-term investments
Amortized Cost	$ 144,729	$ 129,123
Fair Value	144,729	129,123
U.S. Government treasury securities | Short-term investments
Cash equivalents and short-term investments
Amortized Cost	260,999	152,129
Unrealized Gains	604	103
Fair Value	$ 261,603	$ 152,232