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BALANCE SHEET COMPONENTS - Other Long-term Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Jan. 01, 2023
Related Party Transaction [Line Items]    
Long-term warranty reserves $ 22,178 $ 26,130
Unrecognized tax benefits 5,451 16,823
Long-term security deposit payable 91 2,012
Long-term pension liability 1,960 1,632
Refund liability 8,102 14,764
Other 712 2,302
Other long-term liabilities [1] 38,494 63,663
Related party    
Related Party Transaction [Line Items]    
Long-term warranty reserves 4,500 4,700
Related party | TotalEnergies | The Amendment to the Solarization Agreement    
Related Party Transaction [Line Items]    
Other long-term liabilities $ 8,100 $ 14,800
[1] We have related-party balances for transactions with TCL Zhonghuan Renewable Energy Technology Co. Ltd, SunPower and TotalEnergies S.E. and its affiliates as well as unconsolidated entities in which we have a direct
equity investment. These related-party balances are recorded within the “Accounts receivable, net,” “Prepaid expenses and other current assets,” “Other long-term assets,” “Accounts payable,” “Accrued liabilities,” “Contract liabilities, current portion,” “Contract liabilities, net of current portion,” “Convertible debt,” and “Other long-term liabilities” financial statement line items in our Consolidated Balance Sheets (see Note 3, Note 4, Note 6, Note 10 and Note 11).