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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2016
--- | --- | --- | ---
3.75% Convertible notes due 2023 |  |  |
Liabilities |  |  |
Coupon interest rate |  |  | 3.75%
5.00% Convertible notes due 2027 | Unsecured Debt |  |  |
Liabilities |  |  |
Coupon interest rate | 5.00% |  |
Level 1 |  |  |
Assets |  |  |
Total cash equivalents | $ 398,834 | $ 361,822 |
Liabilities |  |  |
Total convertible notes payable | 0 | 0 |
Level 1 | 3.75% Convertible notes due 2023 |  |  |
Liabilities |  |  |
Total convertible notes payable | 0 | 0 |
Level 1 | 5.00% Convertible notes due 2027 |  |  |
Liabilities |  |  |
Total convertible notes payable | 0 | 0 |
Level 1 | Money market funds |  |  |
Assets |  |  |
Total cash equivalents | 398,834 | 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 1 | Agency securities |  |  |
Assets |  |  |
Total cash equivalents | 0 | 0 |
Level 2 |  |  |
Assets |  |  |
Total cash equivalents | 400,536 | 1,056,922 |
Liabilities |  |  |
Total convertible notes payable | 494,900 | 447,509 |
Level 2 | 3.75% Convertible notes due 2023 |  |  |
Liabilities |  |  |
Total convertible notes payable | 322,111 | 447,509 |
Level 2 | 5.00% Convertible notes due 2027 |  |  |
Liabilities |  |  |
Total convertible notes payable | 172,789 | 0 |
Level 2 | Money market funds |  |  |
Assets |  |  |
Total cash equivalents | 0 | 0 |
Level 2 | Government-backed securities |  |  |
Assets |  |  |
Total cash equivalents | 296,000 | 266,250 |
Level 2 | Corporate debt securities |  |  |
Assets |  |  |
Total cash equivalents | 0 | 790,672 |
Level 2 | Agency securities |  |  |
Assets |  |  |
Total cash equivalents | 104,536 | 0 |
Level 3 |  |  |
Assets |  |  |
Total cash equivalents | 0 | 0 |
Liabilities |  |  |
Total convertible notes payable | 0 | 0 |
Level 3 | 3.75% Convertible notes due 2023 |  |  |
Liabilities |  |  |
Total convertible notes payable | 0 | 0 |
Level 3 | 5.00% Convertible notes due 2027 |  |  |
Liabilities |  |  |
Total 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 |
Level 3 | Agency securities |  |  |
Assets |  |  |
Total cash equivalents | $ 0 | $ 0 |

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