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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash equivalents, Amortized Cost	$ 94,570	$ 178,872	$ 176,954	$ 131,329
Available-for-sale securities, Amortized Cost	257,092	286,138
Available-for-sale securities, Gross Unrealized Gains	18	11
Available-for-sale securities, Gross Unrealized (Losses)	(1,412)	(304)
Available-for-sale securities, Estimated Fair Value	255,698	285,845
Total cash equivalents and available-for-sale securities, Amortized Cost	302,003	406,057
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains	18	11
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses)	(1,412)	(304)
Total cash equivalents and available-for-sale securities, Estimated Fair Value	300,609	405,764
Money market funds
ASSETS
Cash equivalents, Amortized Cost	44,911	119,919
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	44,911	119,919
Cash equivalents
ASSETS
Cash equivalents, Amortized Cost	44,911	119,919
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	44,911	119,919
U.S. government-sponsored entity debt securities
ASSETS
Available-for-sale securities, Amortized Cost	23,832	30,700
Available-for-sale securities, Gross Unrealized Gains	0	1
Available-for-sale securities, Gross Unrealized (Losses)	(440)	(87)
Available-for-sale securities, Estimated Fair Value	23,392	30,614
Commercial paper securities
ASSETS
Available-for-sale securities, Amortized Cost	120,750	105,792
Available-for-sale securities, Gross Unrealized Gains	11	7
Available-for-sale securities, Gross Unrealized (Losses)	(375)	(42)
Available-for-sale securities, Estimated Fair Value	120,386	105,757
Corporate debt securities
ASSETS
Available-for-sale securities, Amortized Cost	15,050	33,723
Available-for-sale securities, Gross Unrealized Gains	0	1
Available-for-sale securities, Gross Unrealized (Losses)	(162)	(42)
Available-for-sale securities, Estimated Fair Value	14,888	33,682
Asset-backed securities
ASSETS
Available-for-sale securities, Amortized Cost	38,039	70,807
Available-for-sale securities, Gross Unrealized Gains	2	1
Available-for-sale securities, Gross Unrealized (Losses)	(268)	(107)
Available-for-sale securities, Estimated Fair Value	37,773	70,701
U.S. treasury bills
ASSETS
Available-for-sale securities, Amortized Cost	16,943
Available-for-sale securities, Gross Unrealized Gains	0
Available-for-sale securities, Gross Unrealized (Losses)	(21)
Available-for-sale securities, Estimated Fair Value	16,922
Certificates of deposit
ASSETS
Available-for-sale securities, Amortized Cost	42,478	45,116
Available-for-sale securities, Gross Unrealized Gains	5	1
Available-for-sale securities, Gross Unrealized (Losses)	(146)	(26)
Available-for-sale securities, Estimated Fair Value	$ 42,337	$ 45,091

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