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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Level 1 |  |
Assets |  |
Total cash equivalents | $ 500,885 | $ 361,822
Liabilities |  |
Convertible notes payable | 0 | 0
Level 1 | Money market funds |  |
Assets |  |
Total cash equivalents | 500,885 | 361,822
Level 1 | Government-backed securities |  |
Assets |  |
Total cash equivalents | 0 | 0
Level 1 | Corporate debt securities |  |
Assets |  |
Total cash equivalents | 0 | 0
Level 2 |  |
Assets |  |
Total cash equivalents | 774,250 | 1,056,922
Liabilities |  |
Convertible notes payable | 323,112 | 447,509
Level 2 | Money market funds |  |
Assets |  |
Total cash equivalents | 0 | 0
Level 2 | Government-backed securities |  |
Assets |  |
Total cash equivalents | 179,500 | 266,250
Level 2 | Corporate debt securities |  |
Assets |  |
Total cash equivalents | 594,750 | 790,672
Level 3 |  |
Assets |  |
Total cash equivalents | 0 | 0
Liabilities |  |
Convertible notes payable | 0 | 0
Level 3 | Money market funds |  |
Assets |  |
Total cash equivalents | 0 | 0
Level 3 | Government-backed securities |  |
Assets |  |
Total cash equivalents | 0 | 0
Level 3 | Corporate debt securities |  |
Assets |  |
Total cash equivalents | $ 0 | $ 0

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