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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Hierarchy | The following table represents the estimated fair value of the Company’s financial assets and liabilities (in thousands):
| Fair Value at December 31, 2022 |  | Fair Value at December 31, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) | $ | 398,834 |  |  | $ | — |  |  | $ | — |  | $ | 361,822 |  |  | $ | — |  | $ | —
Government-backed securities (1) | — |  | 296,000 |  |  | — |  | — |  | 266,250 |  |  | —
Corporate debt securities (1) | — |  | — |  |  | — |  | — |  | 790,672 |  |  | —
Agency securities(1) | — |  | 104,536 |  |  | — |  | — |  | — |  |  | —
Total cash equivalents | $ | 398,834 |  |  | $ | 400,536 |  |  | $ | — |  | $ | 361,822 |  |  | $ | 1,056,922 |  |  | $ | —
Liabilities |  |  |  |  |  |  |  |  |  |  |
3.75% Convertible notes due 2023 | $ | — |  |  | $ | 322,111 |  |  | $ | — |  | $ | — |  | $ | 447,509 |  |  | $ | —
5.00% Convertible notes due 2027 | — |  |  | 172,789 |  |  | — |  | — |  | — |  |  | —
Total convertible notes payable | $ | — |  |  | $ | 494,900 |  |  | $ | — |  | $ | — |  | $ | 447,509 |  |  | $ | —
(1)All investments are classified as Cash and cash equivalents as of December 31, 2022 and 2021, on the consolidated balance sheets.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + 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 (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 3: 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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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