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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table presents assets and liabilities measured at fair value on a recurring basis using the above input categories:
| September 30, 2025 |  | December 31, 2024
| (In thousands)
| Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash equivalents, restricted cash and marketable securities: |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 144,482 |  |  | $ | — |  |  | $ | — |  |  | $ | 191,410 |  |  | $ | — |  |  | $ | — |
Certificates of deposit | — |  |  | — |  |  | — |  |  | 95,000 |  |  | — |  |  | — |
Commercial paper | — |  |  | 14,687 |  |  | — |  |  | — |  |  | — |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 24,187 |  |  | — |  |  | — |  |  | 30,092 |  |  | — |
Commercial paper | — |  |  | 25,497 |  |  | — |  |  | — |  |  | 30,713 |  |  | — |
Corporate notes and bonds | — |  |  | 400,595 |  |  | — |  |  | — |  |  | 449,570 |  |  | — |
U.S. Treasuries | — |  |  | 39,996 |  |  | — |  |  | — |  |  | 111,612 |  |  | — |
U.S. Government agency securities | — |  |  | 585,769 |  |  | — |  |  | — |  |  | 631,493 |  |  | — |
Other assets: |  |  |  |  |  |  |  |  |  |  |
Investments in debt securities | — |  |  | 6,300 |  |  | 52,519 |  |  | — |  |  | — |  |  | 64,834 |
Investment in tax equity fund | — |  |  | — |  |  | 3,058 |  |  | — |  |  | — |  |  | — |
Total assets measured at fair value | $ | 144,482 |  |  | $ | 1,097,031 |  |  | $ | 55,577 |  |  | $ | 286,410 |  |  | $ | 1,253,480 |  |  | $ | 64,834 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Warranty obligations: |  |  |  |  |  |  |  |  |  |  |
Current | $ | — |  |  | $ | — |  |  | $ | 24,133 |  |  | $ | — |  |  | $ | — |  |  | $ | 27,173 |
Non-current | — |  |  | — |  |  | 162,946 |  |  | — |  |  | — |  |  | 143,743 |
Total warranty obligations measured at fair value | — |  |  | — |  |  | 187,079 |  |  | — |  |  | — |  |  | 170,916 |
Total liabilities measured at fair value | $ | — |  |  | $ | — |  |  | $ | 187,079 |  |  | $ | — |  |  | $ | — |  |  | $ | 170,916 |
Schedule of Significant Unobservable Inputs used in the Fair Value Measurement of Assets Designated as Level 3 | The changes in the balance in investments in debt securities during the period were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30, |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
| (In thousands)
Balance at beginning of period | $ | 55,693 |  |  | $ | 78,866 |  |  | $ | 64,834 |  |  | $ | 79,855 |  |  |
Investment | 6,300 |  |  | — |  |  | 6,300 |  |  | — |  |  |
Fair value adjustments included in other expense, net | (3,174) |  |  | (741) |  |  | (12,315) |  |  | (1,730) |  |  |
Impairment | — |  |  | (16,988) |  |  | — |  |  | (16,988) |  |  |
Balance at end of period | $ | 58,819 |  |  | $ | 61,137 |  |  | $ | 58,819 |  |  | $ | 61,137 |  |  |
Schedule of Short-term and Long-term Receivables | The Company’s short-term and long-term loan receivables were as follows:
| September 30, 2025 |  |
| (In thousands)
Current | $ | 32,034 |  |  |
Non-current | 16,466 |  |  |
Loan receivables | $ | 48,500 |  |  |
Schedule of Changes in Nonfinancial Liabilities Related to Warrant Obligations Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs | The following table provides information regarding changes in nonfinancial liabilities related to the Company’s warranty obligations measured at fair value on a recurring basis using significant unobservable inputs designated as Level 3 for the periods indicated:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
| (In thousands)
Balance at beginning of period | $ | 182,179 |  |  | $ | 150,193 |  |  | $ | 170,916 |  |  | $ | 161,793 |  |  |
Accruals for warranties issued during period | 7,918 |  |  | 7,752 |  |  | 22,814 |  |  | 20,251 |  |  |
Changes in estimates | 554 |  |  | 2,161 |  |  | 8,430 |  |  | (12,307) |  |  |
Settlements | (4,965) |  |  | (4,707) |  |  | (14,783) |  |  | (17,043) |  |  |
Increase due to accretion expense | 3,498 |  |  | 2,649 |  |  | 9,804 |  |  | 8,244 |  |  |
Change in discount rate | — |  |  | — |  |  | (5,715) |  |  | 759 |  |  |
Other | (2,105) |  |  | (1,328) |  |  | (4,387) |  |  | (4,977) |  |  |
Balance at end of period | $ | 187,079 |  |  | $ | 156,720 |  |  | $ | 187,079 |  |  | $ | 156,720 |  |  |
Schedule of Significant Unobservable Inputs used in the Fair Value Measurement of Liabilities Designated as Level 3 | As of September 30, 2025 and December 31, 2024, the significant unobservable inputs used in the fair value measurement of the Company’s liabilities designated as Level 3 were as follows:
|  |  |  |  |  | Percent Used (Weighted Average)
Item Measured at Fair Value |  | Valuation Technique |  | Description of Significant Unobservable Input |  | September 30, 2025 |  | December 31, 2024
Warranty obligations for products sold since January 1, 2014 |  | Discounted cash flows |  | Profit element and risk premium |  | 17.5% |  | 16.8%
|  | Credit-adjusted risk-free rate |  | 7.7% |  | 7.2%

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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