FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value on a Recurring Basis
Total	$ 212,252	$ 209,208
Money market funds
Fair Value on a Recurring Basis
Total	24,789	24,207
U.S. Treasury securities
Fair Value on a Recurring Basis
Total	30,812	17,088
Municipal securities
Fair Value on a Recurring Basis
Total	2,943	2,985
Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	4,953	12,493
Commercial paper
Fair Value on a Recurring Basis
Total	111,070	91,861
Corporate notes
Fair Value on a Recurring Basis
Total	37,685	60,574
Level 1
Fair Value on a Recurring Basis
Total	24,789	24,207
Level 1 | Money market funds
Fair Value on a Recurring Basis
Total	24,789	24,207
Level 2
Fair Value on a Recurring Basis
Total	187,463	185,001
Level 2 | U.S. Treasury securities
Fair Value on a Recurring Basis
Total	30,812	17,088
Level 2 | Municipal securities
Fair Value on a Recurring Basis
Total	2,943	2,985
Level 2 | Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	4,953	12,493
Level 2 | Commercial paper
Fair Value on a Recurring Basis
Total	111,070	91,861
Level 2 | Corporate notes
Fair Value on a Recurring Basis
Total	$ 37,685	$ 60,574