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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | $ 1,809,568 | $ 1,533,668
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 1,809,568 | 1,533,668
Total financial assets carried at fair value | 1,986,717 | 1,719,255
Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 0 | 0
Total financial assets carried at fair value | 62,968 | 66,531
Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 1,809,568 | 1,533,668
Total financial assets carried at fair value | 1,923,749 | 1,652,724
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 873,856 | 945,841
Commercial paper | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 873,856 | 945,841
Commercial paper | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 0 | 0
Commercial paper | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 873,856 | 945,841
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 618,122 | 540,978
Corporate bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 618,122 | 540,978
Corporate bonds | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 0 | 0
Corporate bonds | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 618,122 | 540,978
U.S. Treasury and government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 301,337 | 33,945
U.S. Treasury and government-sponsored enterprises | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 301,337 | 33,945
U.S. Treasury and government-sponsored enterprises | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 0 | 0
U.S. Treasury and government-sponsored enterprises | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 301,337 | 33,945
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 16,253 | 12,904
Municipal bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 16,253 | 12,904
Municipal bonds | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 0 | 0
Municipal bonds | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities available-for-sale | 16,253 | 12,904
Money market funds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 62,968 | 66,531
Money market funds | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 62,968 | 66,531
Money market funds | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Certificates of deposit | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 114,181 | 119,056
Certificates of deposit | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Certificates of deposit | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 114,181 | $ 119,056

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