v3.26.3
FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Marketable securities:    
Marketable securities: $ 621,301 $ 1,270,083
Equity securities - SunPower common stock 267  
Certificates of deposit    
Marketable securities:    
Marketable securities:   14,515
Commercial paper    
Marketable securities:    
Marketable securities: 13,405 27,893
Corporate notes and bonds    
Marketable securities:    
Marketable securities: 239,480 373,383
U.S. Treasuries    
Marketable securities:    
Marketable securities: 84,117 93,639
U.S. Government agency securities    
Marketable securities:    
Marketable securities: 240,149 573,976
Level 1    
Marketable securities:    
Equity securities - SunPower common stock 267 0
Other current assets:    
Investments in debt securities 0 0
Other assets:    
Investments in debt securities 0 0
Investment in equity instruments 0 0
Investment in tax equity fund 0 0
Total assets measured at fair value 44,417 186,677
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
Level 1 | Certificates of deposit    
Marketable securities:    
Marketable securities: 0 0
Level 1 | Commercial paper    
Marketable securities:    
Marketable securities: 0 0
Level 1 | Corporate notes and bonds    
Marketable securities:    
Marketable securities: 0 0
Level 1 | U.S. Treasuries    
Marketable securities:    
Marketable securities: 0 0
Level 1 | U.S. Government agency securities    
Marketable securities:    
Marketable securities: 0 0
Level 1 | Money market funds    
Cash equivalents:    
Cash equivalents: 44,150 186,677
Level 1 | Commercial paper    
Cash equivalents:    
Cash equivalents: 0 0
Level 1 | U.S. Treasuries    
Cash equivalents:    
Cash equivalents: 0 0
Level 1 | U.S. Government agency securities    
Cash equivalents:    
Cash equivalents: 0 0
Level 2    
Marketable securities:    
Equity securities - SunPower common stock 0 0
Other current assets:    
Investments in debt securities 0 0
Other assets:    
Investments in debt securities 2,319 6,300
Investment in equity instruments 0 0
Investment in tax equity fund 0 0
Total assets measured at fair value 579,470 1,089,706
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
Level 2 | Certificates of deposit    
Marketable securities:    
Marketable securities: 0 14,515
Level 2 | Commercial paper    
Marketable securities:    
Marketable securities: 13,405 12,908
Level 2 | Corporate notes and bonds    
Marketable securities:    
Marketable securities: 239,480 373,383
Level 2 | U.S. Treasuries    
Marketable securities:    
Marketable securities: 64,147 63,754
Level 2 | U.S. Government agency securities    
Marketable securities:    
Marketable securities: 234,149 573,976
Level 2 | Money market funds    
Cash equivalents:    
Cash equivalents: 0 0
Level 2 | Commercial paper    
Cash equivalents:    
Cash equivalents: 0 14,985
Level 2 | U.S. Treasuries    
Cash equivalents:    
Cash equivalents: 19,970 29,885
Level 2 | U.S. Government agency securities    
Cash equivalents:    
Cash equivalents: 6,000 0
Level 3    
Marketable securities:    
Equity securities - SunPower common stock 0 0
Other current assets:    
Investments in debt securities 24,408 0
Other assets:    
Investments in debt securities 29,746 55,046
Investment in equity instruments 5,000 5,000
Investment in tax equity fund 380 754
Total assets measured at fair value 59,534 60,800
Warranty obligations:    
Current 22,771 23,259
Non-current 164,191 169,963
Total warranty obligations measured at fair value 186,962 193,222
Total liabilities measured at fair value 186,962 193,222
Level 3 | Certificates of deposit    
Marketable securities:    
Marketable securities: 0 0
Level 3 | Commercial paper    
Marketable securities:    
Marketable securities: 0 0
Level 3 | Corporate notes and bonds    
Marketable securities:    
Marketable securities: 0 0
Level 3 | U.S. Treasuries    
Marketable securities:    
Marketable securities: 0 0
Level 3 | U.S. Government agency securities    
Marketable securities:    
Marketable securities: 0 0
Level 3 | Money market funds    
Cash equivalents:    
Cash equivalents: 0 0
Level 3 | Commercial paper    
Cash equivalents:    
Cash equivalents: 0 0
Level 3 | U.S. Treasuries    
Cash equivalents:    
Cash equivalents: 0 0
Level 3 | U.S. Government agency securities    
Cash equivalents:    
Cash equivalents: $ 0 $ 0