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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis The carrying value of our cash and cash equivalents, restricted cash, accounts receivable and accounts payable approximate fair value because of their short-term nature. 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. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Assets recognized or disclosed at fair value on the condensed consolidated financial statements on a nonrecurring basis include items such as leasehold improvements, property and equipment, certain long-term investments, operating lease assets, other assets, and goodwill. These assets are measured at fair value whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable or if there has been an observable price change of a non-marketable equity security. For the nine months ended September 30, 2025 and 2024, nonrecurring fair value measurements resulting in asset impairments were not material.

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