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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash equivalents, Amortized Cost	$ 259,393	$ 80,428	$ 114,291	$ 140,418
Available-for-sale securities, Amortized Cost	434,850	303,546
Available-for-sale securities, Gross Unrealized Gains	404	351
Available-for-sale securities, Gross Unrealized (Losses)	(59)	(19)
Available-for-sale securities, Estimated Fair Value	435,195	303,878
Total cash equivalents and available-for-sale securities, Amortized Cost	613,356	337,040
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains	405	352
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses)	(59)	(19)
Total cash equivalents and available-for-sale securities, Estimated Fair Value	613,702	337,373
Money market funds
ASSETS
Cash equivalents, Amortized Cost	172,508	30,496
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	172,508	30,496
Commercial paper securities
ASSETS
Cash equivalents, Amortized Cost	5,998	2,998
Cash equivalents, Gross Unrealized Gains	1	1
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	5,999	2,999
Available-for-sale securities, Amortized Cost	238,248	155,230
Available-for-sale securities, Gross Unrealized Gains	169	145
Available-for-sale securities, Gross Unrealized (Losses)	(19)	(7)
Available-for-sale securities, Estimated Fair Value	238,398	155,368
Corporate debt securities
ASSETS
Available-for-sale securities, Amortized Cost	122,364	94,905
Available-for-sale securities, Gross Unrealized Gains	156	115
Available-for-sale securities, Gross Unrealized (Losses)	(36)	(3)
Available-for-sale securities, Estimated Fair Value	122,484	95,017
Asset-backed securities
ASSETS
Available-for-sale securities, Amortized Cost	13,067
Available-for-sale securities, Gross Unrealized Gains	3
Available-for-sale securities, Gross Unrealized (Losses)	(4)
Available-for-sale securities, Estimated Fair Value	13,066
Cash equivalents
ASSETS
Cash equivalents, Amortized Cost	178,506	33,494
Cash equivalents, Gross Unrealized Gains	1	1
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	178,507	33,495
U.S. government-sponsored entity debt securities
ASSETS
Available-for-sale securities, Amortized Cost	61,171	53,411
Available-for-sale securities, Gross Unrealized Gains	76	91
Available-for-sale securities, Gross Unrealized (Losses)	0	(9)
Available-for-sale securities, Estimated Fair Value	$ 61,247	$ 53,493

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