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MARKETABLE SECURITIES - Schedule of Underlying Maturities of AFS Securities (Details) $ in Thousands | Sep. 30, 2021 USD ($)
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Available-for-sale securities |
Due in one year or less, Cost | $ 428,534
Due in one year or less, Fair Value | 428,711
Due after one year through five years, Cost | 512,953
Due after one year through five years, Fair Value | 512,909
Marketable securities | U.S. government agency securities |
Available-for-sale securities |
Due in one year or less, Cost | 7,049
Due in one year or less, Fair Value | 7,067
Due after one year through five years, Cost | 269,097
Due after one year through five years, Fair Value | 269,014
Marketable securities | Corporate bonds |
Available-for-sale securities |
Due in one year or less, Cost | 235,977
Due in one year or less, Fair Value | 236,101
Due after one year through five years, Cost | 132,685
Due after one year through five years, Fair Value | 132,731
Marketable securities | Certificates of deposit |
Available-for-sale securities |
Due in one year or less, Cost | 175,508
Due in one year or less, Fair Value | 175,542
Due after one year through five years, Cost | 0
Due after one year through five years, Fair Value | 0
Marketable securities | Asset backed securities |
Available-for-sale securities |
Due in one year or less, Cost | 0
Due in one year or less, Fair Value | 0
Due after one year through five years, Cost | 111,171
Due after one year through five years, Fair Value | 111,164
Marketable securities | Commercial paper |
Available-for-sale securities |
Due in one year or less, Cost | 10,000
Due in one year or less, Fair Value | 10,001
Due after one year through five years, Cost | 0
Due after one year through five years, Fair Value | $ 0

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