CASH EQUIVALENTS, INVESTMENTS AND FAIR VALUE MEASUREMENTS - Fair value of company's financial assets (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Total	$ 327,194	$ 579,018
U.S. treasury securities
Total	171,120	246,767
U.S. government agency securities
Total	12,412	5,097
Corporate securities
Total	1,577	35,588
Commercial paper
Total	70,777	235,316
Money market funds
Total	71,308	56,250
Level 1
Total	242,428	303,017
Level 1 | U.S. treasury securities
Total	171,120	246,767
Level 1 | Money market funds
Total	71,308	56,250
Level 2
Total	84,766	276,001
Level 2 | U.S. government agency securities
Total	12,412	5,097
Level 2 | Corporate securities
Total	1,577	35,588
Level 2 | Commercial paper
Total	$ 70,777	$ 235,316