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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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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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