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INVESTMENTS IN DEBT SECURITIES - Short-Term and Long-Term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,320,232 |
Fair Value | 2,319,916 |
Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 868,162 | $ 692,901
Gross Unrealized Gains | 875 | 2,478
Gross Unrealized Losses | (228) | (267)
Fair Value | 868,809 | 695,112
Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,452,070 | 461,455
Gross Unrealized Gains | 499 | 2,552
Gross Unrealized Losses | (1,462) | (57)
Fair Value | 1,451,107 | 463,950
U.S. agency securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 93,867 | 153,386
Gross Unrealized Gains | 227 | 782
Gross Unrealized Losses | (6) | (164)
Fair Value | 94,088 | 154,004
U.S. agency securities | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 152,820 | 168,762
Gross Unrealized Gains | 46 | 519
Gross Unrealized Losses | (175) | (3)
Fair Value | 152,691 | 169,278
Corporate bonds | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 290,231 | 76,957
Gross Unrealized Gains | 369 | 256
Gross Unrealized Losses | (77) | (14)
Fair Value | 290,523 | 77,199
Corporate bonds | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 704,676 | 174,655
Gross Unrealized Gains | 337 | 1,401
Gross Unrealized Losses | (916) | (42)
Fair Value | 704,097 | 176,014
Commercial paper | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 141,551 | 4,999
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 141,551 | 4,999
Municipal securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 15,738 | 10,377
Gross Unrealized Gains | 12 | 57
Gross Unrealized Losses | 0 | (3)
Fair Value | 15,750 | 10,431
Municipal securities | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 21,952 | 1,045
Gross Unrealized Gains | 23 | 15
Gross Unrealized Losses | (10) | 0
Fair Value | 21,965 | 1,060
Certificates of deposit | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,200 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 8,200 |
U.S. government securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 308,080 | 404,194
Gross Unrealized Gains | 248 | 1,244
Gross Unrealized Losses | (5) | (4)
Fair Value | 308,323 | 405,434
U.S. government securities | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 543,483 | 91,642
Gross Unrealized Gains | 34 | 433
Gross Unrealized Losses | (337) | (2)
Fair Value | 543,180 | 92,073
Foreign government securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,495 | 42,988
Gross Unrealized Gains | 19 | 139
Gross Unrealized Losses | (140) | (82)
Fair Value | 10,374 | 43,045
Foreign government securities | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 29,139 | 25,351
Gross Unrealized Gains | 59 | 184
Gross Unrealized Losses | (24) | (10)
Fair Value | $ 29,174 | $ 25,525

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