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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets: |  |
Total financial assets | $ 613,065 | $ 717,596
Money market deposits |  |
Financial Assets: |  |
Total financial assets | 24,619 | 28,990
U.S. Treasury securities |  |
Financial Assets: |  |
Total financial assets | 495,538 | 597,744
Corporate bonds and notes |  |
Financial Assets: |  |
Total financial assets | 16,248 | 12,328
Municipal securities |  |
Financial Assets: |  |
Total financial assets | 76,660 | 78,534
Level 1 |  |
Financial Assets: |  |
Total financial assets | 520,157 | 626,734
Level 1 | Money market deposits |  |
Financial Assets: |  |
Total financial assets | 24,619 | 28,990
Level 1 | U.S. Treasury securities |  |
Financial Assets: |  |
Total financial assets | 495,538 | 597,744
Level 2 |  |
Financial Assets: |  |
Total financial assets | 92,908 | 90,862
Level 2 | Convertible Notes |  |
Liabilities: |  |
Fair value of financial liabilities | 792,900 |
Level 2 | Corporate bonds and notes |  |
Financial Assets: |  |
Total financial assets | 16,248 | 12,328
Level 2 | Municipal securities |  |
Financial Assets: |  |
Total financial assets | $ 76,660 | $ 78,534

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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