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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
3.75% Convertible notes due 2023 |  |
Liabilities |  |
Coupon interest rate | 3.75% | 3.75%
5.00% Convertible notes due 2027 | Unsecured Debt |  |
Liabilities |  |
Coupon interest rate | 5.00% | 5.00%
Level 1 |  |
Assets |  |
Total cash equivalents | $ 171,824 | $ 398,834
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 | 171,824 | 398,834
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 | 245,622 | 400,536
Liabilities |  |
Total convertible notes payable | 100,909 | 494,900
Level 2 | 3.75% Convertible notes due 2023 |  |
Liabilities |  |
Total convertible notes payable | 0 | 322,111
Level 2 | 5.00% Convertible notes due 2027 |  |
Liabilities |  |
Total convertible notes payable | 100,909 | 172,789
Level 2 | Money market funds |  |
Assets |  |
Total cash equivalents | 0 | 0
Level 2 | Government-backed securities |  |
Assets |  |
Total cash equivalents | 200,000 | 296,000
Level 2 | Corporate debt securities |  |
Assets |  |
Total cash equivalents | 45,622 | 0
Level 2 | Agency securities |  |
Assets |  |
Total cash equivalents | 0 | 104,536
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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