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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets:
Marketable securities	$ 1,357,260	$ 1,539,890
Certificates of deposit
Assets:
Marketable securities	93,232	125,092
Commercial paper
Assets:
Marketable securities	21,443	30,713
Corporate notes and bonds
Assets:
Marketable securities	399,275	449,570
U.S. Treasuries
Assets:
Marketable securities	88,525	111,612
U.S. Government agency securities
Assets:
Marketable securities	579,305	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	240,480	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	175,480	191,410
Recurring | Level 1 | Certificates of deposit
Assets:
Cash, cash equivalents and restricted cash	65,000	95,000
Recurring | Level 1 | Commercial paper
Assets:
Cash, cash equivalents and restricted cash	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets:
Cash, cash equivalents and restricted cash		0
Recurring | Level 2
Assets:
Investments in debt securities	0	0
Investment in tax equity fund	0	0
Total assets measured at fair value	1,116,780	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	28,232	30,092
Recurring | Level 2 | Commercial paper
Assets:
Marketable securities	21,443	30,713
Recurring | Level 2 | Corporate notes and bonds
Assets:
Marketable securities	399,275	449,570
Recurring | Level 2 | U.S. Treasuries
Assets:
Marketable securities	88,525	111,612
Recurring | Level 2 | U.S. Government agency securities
Assets:
Marketable securities	579,305	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	0	0
Recurring | Level 2 | Corporate notes and bonds
Assets:
Cash, cash equivalents and restricted cash	0	0
Recurring | Level 3
Assets:
Investments in debt securities	65,157	64,834
Investment in tax equity fund	5,190	0
Total assets measured at fair value	70,347	64,834
Warranty obligations:
Current	26,200	27,173
Non-current	153,853	143,743
Total warranty obligations measured at fair value	180,053	170,916
Total liabilities measured at fair value	180,053	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
Recurring | Level 3 | Corporate notes and bonds
Assets:
Cash, cash equivalents and restricted cash	$ 0	$ 0

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