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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category | The following tables show our cash, cash equivalents, and debt investments by significant investment category:
| September 30, 2025
| Adjusted cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Current Investments |  | Long-term Investments
Cash | $ | 88,119 |  | $ | - |  | $ | - |  | $ | 88,119 |  | $ | 88,119 |  | $ | - |  | $ | -
Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 531,867 |  |  | - |  |  | - |  |  | 531,867 |  |  | 531,867 |  |  | - |  |  | - |
Time deposits | 78,757 |  |  | - |  |  | - |  |  | 78,757 |  |  | 78,757 |  |  | - |  |  | - |
U.S. Treasury securities | 954,297 |  |  | 4,262 |  |  | - |  |  | 958,559 |  |  | - |  |  | 696,607 |  |  | 257,690 |
Corporate debt securities | 18,432 |  |  | 44 |  |  | - |  |  | 18,476 |  |  | - |  |  | 18,432 |  |  | - |
Subtotal | 1,583,353 |  |  | 4,306 |  |  | - |  |  | 1,587,659 |  |  | 610,624 |  |  | 715,039 |  |  | 257,690 |
Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt security(1) | 15,201 |  |  | 40 |  |  | - |  |  | 15,241 |  |  | - |  |  | 3,200 |  |  | 12,001 |
Notes receivable(2) | 3,898 |  |  | 394 |  |  | - |  |  | 4,292 |  |  | - |  |  | 4,292 |  |  | - |
Subtotal | 19,099 |  |  | 434 |  |  | - |  |  | 19,533 |  |  | - |  |  | 7,492 |  |  | 12,001 |
Total | $ | 1,690,571 |  |  | $ | 4,740 |  |  | $ | - |  |  | $ | 1,695,311 |  |  | $ | 698,743 |  |  | $ | 722,531 |  |  | $ | 269,691 |
| December 31, 2024
| Adjusted cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Current Investments |  | Long-term Investments
Cash | $ | 95,969 |  | $ | - |  | $ | - |  | $ | 95,969 |  | $ | 95,969 |  | $ | - |  | $ | -
Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 574,689 |  |  | - |  |  | - |  |  | 574,689 |  |  | 574,689 |  |  | - |  |  | - |
Time deposits | 77,879 |  |  | - |  |  | - |  |  | 77,879 |  |  | 77,879 |  |  | - |  |  | - |
U.S. Treasury securities | 1,404,777 |  |  | 4,831 |  |  | 693 |  |  | 1,408,915 |  |  | - |  |  | 635,392 |  |  | 769,385 |
Corporate debt securities | 48,210 |  |  | 116 |  |  | - |  |  | 48,326 |  |  | - |  |  | 34,736 |  |  | 13,474 |
Subtotal | 2,105,555 |  |  | 4,947 |  |  | 693 |  |  | 2,109,809 |  |  | 652,568 |  |  | 670,128 |  |  | 782,859 |
Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt security(1) | 16,401 |  |  | 11 |  |  | - |  |  | 16,412 |  |  | - |  |  | 2,000 |  |  | 14,401 |
Notes receivable(2) | 3,763 |  |  | 250 |  |  | - |  |  | 4,013 |  |  | - |  |  | 2,250 |  |  | 1,763 |
Subtotal | 20,164 |  |  | 261 |  |  | - |  |  | 20,425 |  |  | - |  |  | 4,250 |  |  | 16,164 |
Total | $ | 2,221,688 |  |  | $ | 5,208 |  |  | $ | 693 |  |  | $ | 2,226,203 |  |  | $ | 748,537 |  |  | $ | 674,378 |  |  | $ | 799,023 |
(1)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. (2)We have elected to measure our investment in convertible notes receivable of private companies at fair value under the fair value option. The fair value of the notes receivable are 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.

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