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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
ASSETS
Cash equivalents, Amortized Cost	$ 467,443	$ 80,428	$ 169,222	$ 140,418
Available-for-sale securities, Amortized Cost	196,431	303,546
Available-for-sale securities, Gross Unrealized Gains	979	351
Available-for-sale securities, Gross Unrealized (Losses)	0	(19)
Available-for-sale securities, Estimated Fair Value	197,410	303,878
Total cash equivalents and available-for-sale securities, Amortized Cost	312,824	337,040
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains	979	352
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses)	0	(19)
Total cash equivalents and available-for-sale securities, Estimated Fair Value	313,803	337,373
Money market funds
ASSETS
Cash equivalents, Amortized Cost	116,393	30,496
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	116,393	30,496
Commercial paper securities
ASSETS
Cash equivalents, Amortized Cost		2,998
Cash equivalents, Gross Unrealized Gains		1
Cash equivalents, Gross Unrealized (Losses)		0
Cash equivalents, Estimated Fair Value		2,999
Available-for-sale securities, Amortized Cost	89,796	155,230
Available-for-sale securities, Gross Unrealized Gains	383	145
Available-for-sale securities, Gross Unrealized (Losses)	0	(7)
Available-for-sale securities, Estimated Fair Value	90,179	155,368
Cash equivalents
ASSETS
Cash equivalents, Amortized Cost		33,494
Cash equivalents, Gross Unrealized Gains		1
Cash equivalents, Gross Unrealized (Losses)		0
Cash equivalents, Estimated Fair Value		33,495
Corporate debt securities
ASSETS
Available-for-sale securities, Amortized Cost	81,424	94,905
Available-for-sale securities, Gross Unrealized Gains	420	115
Available-for-sale securities, Gross Unrealized (Losses)	0	(3)
Available-for-sale securities, Estimated Fair Value	81,844	95,017
U.S. government-sponsored entity debt securities
ASSETS
Available-for-sale securities, Amortized Cost	25,211	53,411
Available-for-sale securities, Gross Unrealized Gains	176	91
Available-for-sale securities, Gross Unrealized (Losses)	0	(9)
Available-for-sale securities, Estimated Fair Value	$ 25,387	$ 53,493

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