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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Cash equivalents, Amortized Cost	$ 122,975	$ 131,329	$ 85,749	$ 80,428
Available-for-sale securities, Amortized Cost	506,447	560,575
Available-for-sale securities, Gross Unrealized Gains	124	86
Available-for-sale securities, Gross Unrealized (Losses)	(31)	(37)
Available-for-sale securities, Estimated Fair Value	506,540	560,624
Total cash equivalents and available-for-sale securities, Amortized Cost	554,082	613,740
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains	124	86
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses)	(31)	(37)
Total cash equivalents and available-for-sale securities, Estimated Fair Value	554,175	613,789
Money market funds
ASSETS
Cash equivalents, Amortized Cost	47,635	53,165
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	47,635	53,165
Commercial paper securities
ASSETS
Available-for-sale securities, Amortized Cost	177,101	213,500
Available-for-sale securities, Gross Unrealized Gains	53	41
Available-for-sale securities, Gross Unrealized (Losses)	0	(8)
Available-for-sale securities, Estimated Fair Value	177,154	213,533
Corporate debt securities
ASSETS
Available-for-sale securities, Amortized Cost	39,031	59,575
Available-for-sale securities, Gross Unrealized Gains	5	16
Available-for-sale securities, Gross Unrealized (Losses)	(14)	(17)
Available-for-sale securities, Estimated Fair Value	39,022	59,574
Certificates of deposit
ASSETS
Available-for-sale securities, Amortized Cost	11,495	12,311
Available-for-sale securities, Gross Unrealized Gains	0	0
Available-for-sale securities, Gross Unrealized (Losses)	(1)	0
Available-for-sale securities, Estimated Fair Value	11,494	12,311
Asset-backed securities
ASSETS
Available-for-sale securities, Amortized Cost	36,419	17,905
Available-for-sale securities, Gross Unrealized Gains	7	10
Available-for-sale securities, Gross Unrealized (Losses)	(16)	(7)
Available-for-sale securities, Estimated Fair Value	36,410	17,908
Cash equivalents
ASSETS
Cash equivalents, Amortized Cost	47,635	53,165
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	47,635	53,165
U.S. government-sponsored entity debt securities
ASSETS
Available-for-sale securities, Amortized Cost	242,401	257,284
Available-for-sale securities, Gross Unrealized Gains	59	19
Available-for-sale securities, Gross Unrealized (Losses)	0	(5)
Available-for-sale securities, Estimated Fair Value	$ 242,460	$ 257,298

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