FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities at Fair Value, Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	$ 3,157,449	$ 6,262,905
Short-term investments	1,136,633	0
Long-term investments	278,055	0
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	3,157,449
Cash, estimated fair value		6,262,905
Gross Unrealized Gains	595
Gross Unrealized Losses	(1,286)
Short-term investments	1,136,633
Long-term investments	278,055
Total assets measured at fair value, amortized cost	4,572,828
Total assets measured at fair value, fair value	4,572,137
Fair Value, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	179,950
Cash, estimated fair value	179,950	160,888
Short-term investments	0
Long-term investments	0
Fair Value, Recurring | Level 1:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	2,775,150
Amortized cost	3,655,230
Gross Unrealized Gains	518
Gross Unrealized Losses	(876)
Estimated Fair Value	3,654,872
Short-term investments	684,916
Long-term investments	194,806
Fair Value, Recurring | Level 2:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	202,349
Amortized cost	737,648
Gross Unrealized Gains	77
Gross Unrealized Losses	(410)
Estimated Fair Value	737,315
Short-term investments	451,717
Long-term investments	83,249
Fair Value, Recurring | Money market funds | Level 1:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	2,710,148
Cash, estimated fair value		$ 6,102,017
Amortized cost	2,710,148
Gross Unrealized Gains	0
Gross Unrealized Losses
Estimated Fair Value	2,710,148
Short-term investments	0
Long-term investments	0
Fair Value, Recurring | U.S. Treasury securities | Level 1:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	65,002
Amortized cost	945,082
Gross Unrealized Gains	518
Gross Unrealized Losses	(876)
Estimated Fair Value	944,724
Short-term investments	684,916
Long-term investments	194,806
Fair Value, Recurring | U.S. government agency securities | Level 2:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	6,909
Amortized cost	6,910
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Estimated Fair Value	6,909
Short-term investments	0
Long-term investments	0
Fair Value, Recurring | Certificates of deposit | Level 2:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	20,999
Amortized cost	221,573
Gross Unrealized Gains	11
Gross Unrealized Losses	(41)
Estimated Fair Value	221,543
Short-term investments	200,544
Long-term investments	0
Fair Value, Recurring | Commercial paper | Level 2:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	173,404
Amortized cost	314,453
Gross Unrealized Gains	12
Gross Unrealized Losses	(171)
Estimated Fair Value	314,294
Short-term investments	140,890
Long-term investments	0
Fair Value, Recurring | Corporate debt securities | Level 2:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, amortized cost	1,037
Amortized cost	194,712
Gross Unrealized Gains	54
Gross Unrealized Losses	(197)
Estimated Fair Value	194,569
Short-term investments	110,283
Long-term investments	$ 83,249