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MARKETABLE SECURITIES - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale securities
Amortized Cost	$ 941,487	$ 936,476
Gains in Accumulated Other Comprehensive Income (Loss)	279	696
Losses in Accumulated Other Comprehensive Income (Loss)	(146)	0
Estimated Fair Value	941,620	937,172
Cash equivalents
Available-for-sale securities
Amortized Cost		589,986
Gains in Accumulated Other Comprehensive Income (Loss)		8
Losses in Accumulated Other Comprehensive Income (Loss)		0
Estimated Fair Value		589,994
Marketable securities
Available-for-sale securities
Amortized Cost		346,490
Gains in Accumulated Other Comprehensive Income (Loss)		688
Losses in Accumulated Other Comprehensive Income (Loss)		0
Estimated Fair Value	941,620	347,178
Corporate bonds | Marketable securities
Available-for-sale securities
Amortized Cost	368,662	132,301
Gains in Accumulated Other Comprehensive Income (Loss)	213	612
Losses in Accumulated Other Comprehensive Income (Loss)	(43)	0
Estimated Fair Value	368,832	132,913
U.S. government agency securities | Cash equivalents
Available-for-sale securities
Amortized Cost		589,986
Gains in Accumulated Other Comprehensive Income (Loss)		8
Losses in Accumulated Other Comprehensive Income (Loss)		0
Estimated Fair Value		589,994
U.S. government agency securities | Marketable securities
Available-for-sale securities
Amortized Cost	276,146	207,119
Gains in Accumulated Other Comprehensive Income (Loss)	19	52
Losses in Accumulated Other Comprehensive Income (Loss)	(84)	0
Estimated Fair Value	276,081	207,171
Certificates of deposit | Marketable securities
Available-for-sale securities
Amortized Cost	175,508
Gains in Accumulated Other Comprehensive Income (Loss)	35
Losses in Accumulated Other Comprehensive Income (Loss)	(1)
Estimated Fair Value	175,542
Commercial paper | Marketable securities
Available-for-sale securities
Amortized Cost	10,000
Gains in Accumulated Other Comprehensive Income (Loss)	1
Losses in Accumulated Other Comprehensive Income (Loss)	0
Estimated Fair Value	10,001
Asset backed securities | Marketable securities
Available-for-sale securities
Amortized Cost	111,171	7,070
Gains in Accumulated Other Comprehensive Income (Loss)	11	24
Losses in Accumulated Other Comprehensive Income (Loss)	(18)	0
Estimated Fair Value	$ 111,164	$ 7,094

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