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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Measurements [Abstract] |
Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category |
| December 31, 2023
| Adjusted cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Current Investments |  | Long-term Investments
Cash | $ | 128,458 |  | $ | - |  | $ | - |  | $ | 128,458 |  | $ | 128,458 |  | $ | - |  | $ | -
Level 1(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 355,872 |  |  | - |  |  | - |  |  | 355,872 |  |  | 355,872 |  |  | - |  |  | -
Time deposits |  | 76,279 |  |  | - |  |  | - |  |  | 76,279 |  |  | 76,279 |  |  | - |  |  | -
U.S. Treasury securities |  | 1,200,658 |  |  | 4,352 |  |  | 4,083 |  |  | 1,200,927 |  |  | - |  |  | 731,339 |  |  | 469,319
Corporate debt securities |  | 19,755 |  |  | 13 |  |  | 7 |  |  | 19,761 |  |  | - |  |  | - |  |  | 19,755
Subtotal |  | 1,652,564 |  |  | 4,365 |  |  | 4,090 |  |  | 1,652,839 |  |  | 432,151 |  |  | 731,339 |  |  | 489,074
Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt security(2) |  | 17,401 |  |  | - |  |  | 27 |  |  | 17,374 |  |  | - |  |  | 999 |  |  | 16,402
Notes receivable(3) |  | 14,500 |  |  | 1,289 |  |  | 141 |  |  | 15,648 |  |  | - |  |  | 2,500 |  |  | 13,148
Subtotal |  | 31,901 |  |  | 1,289 |  |  | 168 |  |  | 33,022 |  |  | - |  |  | 3,499 |  |  | 29,550
Total | $ | 1,812,923 |  | $ | 5,654 |  | $ | 4,258 |  | $ | 1,814,319 |  | $ | 560,609 |  | $ | 734,838 |  | $ | 518,624
| December 31, 2022
| Adjusted cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Current Investments |  | Long-term Investments
Cash | $ | 75,829 |  | $ | - |  | $ | - |  | $ | 75,829 |  | $ | 75,829 |  | $ | - |  | $ | -
Level 1(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 232,477 |  |  | - |  |  | - |  |  | 232,477 |  |  | 232,477 |  |  | - |  |  | -
Time deposits |  | 75,694 |  |  | - |  |  | - |  |  | 75,694 |  |  | 75,694 |  |  | - |  |  | -
U.S. Treasury securities |  | 847,354 |  |  | 63 |  |  | 14,355 |  |  | 833,062 |  |  | - |  |  | 515,136 |  |  | 332,218
Subtotal |  | 1,155,525 |  |  | 63 |  |  | 14,355 |  |  | 1,141,233 |  |  | 308,171 |  |  | 515,136 |  |  | 332,218
Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt security(2) |  | 17,900 |  |  | - |  |  | 700 |  |  | 17,200 |  |  | - |  |  | - |  |  | 17,900
Note receivable(3) |  | 4,860 |  |  | 222 |  |  | - |  |  | 5,082 |  |  | - |  |  | - |  |  | 5,082
Subtotal |  | 22,760 |  |  | 222 |  |  | 700 |  |  | 22,282 |  |  | - |  |  | - |  |  | 22,982
Total | $ | 1,254,114 |  | $ | 285 |  | $ | 15,055 |  | $ | 1,239,344 |  | $ | 384,000 |  | $ | 515,136 |  | $ | 355,200
(1) Level 1: Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. (2) The fair value of the corporate debt security is measured using Level 3 (unobservable) inputs. We determined the fair value for the corporate debt security using an internally-developed valuation model and unobservable inputs include credit and liquidity spreads and effective maturity. (3) We have elected to measure our investments in convertible notes receivable of private companies at fair value under the fair value option. The fair value of the notes receivable is measured using Level 3 (unobservable) inputs. We determined the fair value for the notes receivable using an internally-developed valuation model and unobservable inputs include estimates of the equity value of the underlying business and the timing and probability of future financing events.
Summary of Assets Measured at Fair Value on Nonrecurring Basis |
|  | Carrying Value
|  | December 31,
| Level | 2023 |  | 2022
Leasehold improvements, property and equipment, net | 3 | $ | 3,571 |  | $ | 264
Operating lease assets | 3 |  | 4,505 |  |  | 713
Total |  | $ | 8,076 |  | $ | 977

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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