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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Marketable securities | $ 1,235,213 | $ 1,539,890
Certificates of deposit |  |
Assets: |  |
Marketable securities | 24,187 | 125,092
Commercial paper |  |
Assets: |  |
Marketable securities | 40,184 | 30,713
Corporate notes and bonds |  |
Assets: |  |
Marketable securities | 400,595 | 449,570
U.S. Treasuries |  |
Assets: |  |
Marketable securities | 39,996 | 111,612
U.S. Government agency securities |  |
Assets: |  |
Marketable securities | 585,769 | 631,493
Recurring | Level 1 |  |
Assets: |  |
Investments in debt securities | 0 | 0
Investment in tax equity fund | 0 | 0
Total assets measured at fair value | 144,482 | 286,410
Warranty obligations: |  |
Current | 0 | 0
Non-current | 0 | 0
Total warranty obligations measured at fair value | 0 | 0
Total liabilities measured at fair value | 0 | 0
Recurring | Level 1 | Certificates of deposit |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 1 | Commercial paper |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 1 | Corporate notes and bonds |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 1 | U.S. Treasuries |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 1 | U.S. Government agency securities |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 1 | Money market funds |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 144,482 | 191,410
Recurring | Level 1 | Certificates of deposit |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 0 | 95,000
Recurring | Level 1 | Commercial paper |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 0 | 0
Recurring | Level 2 |  |
Assets: |  |
Investments in debt securities | 6,300 | 0
Investment in tax equity fund | 0 | 0
Total assets measured at fair value | 1,097,031 | 1,253,480
Warranty obligations: |  |
Current | 0 | 0
Non-current | 0 | 0
Total warranty obligations measured at fair value | 0 | 0
Total liabilities measured at fair value | 0 | 0
Recurring | Level 2 | Certificates of deposit |  |
Assets: |  |
Marketable securities | 24,187 | 30,092
Recurring | Level 2 | Commercial paper |  |
Assets: |  |
Marketable securities | 25,497 | 30,713
Recurring | Level 2 | Corporate notes and bonds |  |
Assets: |  |
Marketable securities | 400,595 | 449,570
Recurring | Level 2 | U.S. Treasuries |  |
Assets: |  |
Marketable securities | 39,996 | 111,612
Recurring | Level 2 | U.S. Government agency securities |  |
Assets: |  |
Marketable securities | 585,769 | 631,493
Recurring | Level 2 | Money market funds |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 0 | 0
Recurring | Level 2 | Certificates of deposit |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 0 | 0
Recurring | Level 2 | Commercial paper |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 14,687 | 0
Recurring | Level 3 |  |
Assets: |  |
Investments in debt securities | 52,519 | 64,834
Investment in tax equity fund | 3,058 | 0
Total assets measured at fair value | 55,577 | 64,834
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
Recurring | Level 3 | Certificates of deposit |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 3 | Commercial paper |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 3 | Corporate notes and bonds |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 3 | U.S. Treasuries |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 3 | U.S. Government agency securities |  |
Assets: |  |
Marketable securities | 0 | 0
Recurring | Level 3 | Money market funds |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 0 | 0
Recurring | Level 3 | Certificates of deposit |  |
Assets: |  |
Cash, cash equivalents and restricted cash | 0 | 0
Recurring | Level 3 | Commercial paper |  |
Assets: |  |
Cash, cash equivalents and restricted cash | $ 0 | $ 0

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