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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash equivalents, Amortized Cost	$ 85,749	$ 80,428	$ 80,968	$ 140,418
Available-for-sale securities, Amortized Cost	276,794	303,546
Available-for-sale securities, Gross Unrealized Gains	710	351
Available-for-sale securities, Gross Unrealized (Losses)	(123)	(19)
Available-for-sale securities, Estimated Fair Value	277,381	303,878
Total cash equivalents and available-for-sale securities, Amortized Cost	336,403	337,040
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains	710	352
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses)	(123)	(19)
Total cash equivalents and available-for-sale securities, Estimated Fair Value	336,990	337,373
Money market funds
ASSETS
Cash equivalents, Amortized Cost	59,609	30,496
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value	59,609	30,496
Commercial paper securities
ASSETS
Cash equivalents, Amortized Cost		2,998
Cash equivalents, Gross Unrealized Gains	0	1
Cash equivalents, Gross Unrealized (Losses)	0	0
Cash equivalents, Estimated Fair Value		2,999
Available-for-sale securities, Amortized Cost	129,827	155,230
Available-for-sale securities, Gross Unrealized Gains	352	145
Available-for-sale securities, Gross Unrealized (Losses)	0	(7)
Available-for-sale securities, Estimated Fair Value	130,179	155,368
Cash equivalents
ASSETS
Cash equivalents, Amortized Cost	59,609	33,494
Cash equivalents, Gross Unrealized Gains		1
Cash equivalents, Gross Unrealized (Losses)		0
Cash equivalents, Estimated Fair Value	59,609	33,495
Corporate debt securities
ASSETS
Available-for-sale securities, Amortized Cost	95,534	94,905
Available-for-sale securities, Gross Unrealized Gains	107	115
Available-for-sale securities, Gross Unrealized (Losses)	(123)	(3)
Available-for-sale securities, Estimated Fair Value	95,518	95,017
U.S. government-sponsored entity debt securities
ASSETS
Available-for-sale securities, Amortized Cost	51,433	53,411
Available-for-sale securities, Gross Unrealized Gains	251	91
Available-for-sale securities, Gross Unrealized (Losses)	0	(9)
Available-for-sale securities, Estimated Fair Value	$ 51,684	$ 53,493

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