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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash equivalents, Amortized Cost	$ 120,257	$ 178,872	$ 122,975	$ 131,329
Available-for-sale securities, Amortized Cost	281,430	286,138
Available-for-sale securities, Gross Unrealized Gains	0	11
Available-for-sale securities, Gross Unrealized (Losses)	(1,376)	(304)
Available-for-sale securities, Estimated Fair Value	280,054	285,845
Total cash equivalents and available-for-sale securities, Amortized Cost	346,266	406,057
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains	0	11
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses)	(1,377)	(304)
Total cash equivalents and available-for-sale securities, Estimated Fair Value	344,889	405,764
Money market funds
ASSETS
Cash equivalents, Amortized Cost	49,827	119,919
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	49,827	119,919
Cash equivalents
ASSETS
Cash equivalents, Amortized Cost	64,836	119,919
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	(1)	0
Cash equivalents, Estimated Fair Value	64,835	119,919
U.S. government-sponsored entity debt securities
ASSETS
Cash equivalents, Amortized Cost	15,009
Cash equivalents, Gross Unrealized Gains
Cash equivalents, Gross Unrealized (Losses)	(1)
Cash equivalents, Estimated Fair Value	15,008
Available-for-sale securities, Amortized Cost	24,788	30,700
Available-for-sale securities, Gross Unrealized Gains	0	1
Available-for-sale securities, Gross Unrealized (Losses)	(347)	(87)
Available-for-sale securities, Estimated Fair Value	24,441	30,614
Commercial paper securities
ASSETS
Available-for-sale securities, Amortized Cost	117,709	105,792
Available-for-sale securities, Gross Unrealized Gains	0	7
Available-for-sale securities, Gross Unrealized (Losses)	(384)	(42)
Available-for-sale securities, Estimated Fair Value	117,325	105,757
Corporate debt securities
ASSETS
Available-for-sale securities, Amortized Cost	17,522	33,723
Available-for-sale securities, Gross Unrealized Gains	0	1
Available-for-sale securities, Gross Unrealized (Losses)	(149)	(42)
Available-for-sale securities, Estimated Fair Value	17,373	33,682
Asset-backed securities
ASSETS
Available-for-sale securities, Amortized Cost	67,890	70,807
Available-for-sale securities, Gross Unrealized Gains	0	1
Available-for-sale securities, Gross Unrealized (Losses)	(375)	(107)
Available-for-sale securities, Estimated Fair Value	67,515	70,701
U.S. treasury bills
ASSETS
Available-for-sale securities, Amortized Cost	2,995
Available-for-sale securities, Gross Unrealized Gains	0
Available-for-sale securities, Gross Unrealized (Losses)	0
Available-for-sale securities, Estimated Fair Value	2,995
Certificates of deposit
ASSETS
Available-for-sale securities, Amortized Cost	50,526	45,116
Available-for-sale securities, Gross Unrealized Gains	0	1
Available-for-sale securities, Gross Unrealized (Losses)	(121)	(26)
Available-for-sale securities, Estimated Fair Value	$ 50,405	$ 45,091

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