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Fair Value Measurements - Schedule of Financial Assets and Liabilities that are Measured at Fair Value, on a Recurring Basis (Details) - USD ($)
Dec. 28, 2025
Dec. 29, 2024
Financial Assets    
Financial assets $ 3,841 $ 3,841
Financial Liabilities    
Financial liabilities 132,089 102,561
Restricted cash [Member]    
Financial Assets    
Financial assets 3,841 3,841
July 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1] 19,604 13,563
July 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1] 12,615 21,127
September 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1] 37,930 55,474
September 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1] 5,870 6,958
July 2025 Note derivative liability– related party [Member]    
Financial Liabilities    
Financial liabilities [1] 3,246  
September 2025 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1] 14,756  
November 2025 Note derivative liability – related party [Member]    
Financial Liabilities    
Financial liabilities [1] 1,488  
Forward purchase agreement liabilities [Member]    
Financial Liabilities    
Financial liabilities 3,965 3,494 [2]
SAFE Agreement with related party [Member]    
Financial Liabilities    
Financial liabilities 535 384
Private placement warrants [Member]    
Financial Liabilities    
Financial liabilities 1,692 627
Working capital warrants [Member]    
Financial Liabilities    
Financial liabilities 194 72
Public warrants [Member]    
Financial Liabilities    
Financial liabilities 2,475 862
Deferred Sunder Consideration Shares [Member]    
Financial Liabilities    
Financial liabilities 10,840  
Deferred Ambia Consideration Shares [Member]    
Financial Liabilities    
Financial liabilities 16,879  
Fair Value, Inputs, Level 1 [Member]    
Financial Assets    
Financial assets 3,841 3,841
Financial Liabilities    
Financial liabilities 13,315 862
Fair Value, Inputs, Level 1 [Member] | Restricted cash [Member]    
Financial Assets    
Financial assets 3,841 3,841
Fair Value, Inputs, Level 1 [Member] | July 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 1 [Member] | July 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 1 [Member] | September 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 1 [Member] | September 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 1 [Member] | July 2025 Note derivative liability– related party [Member]    
Financial Liabilities    
Financial liabilities [1]  
Fair Value, Inputs, Level 1 [Member] | September 2025 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1]  
Fair Value, Inputs, Level 1 [Member] | November 2025 Note derivative liability – related party [Member]    
Financial Liabilities    
Financial liabilities [1]  
Fair Value, Inputs, Level 1 [Member] | Forward purchase agreement liabilities [Member]    
Financial Liabilities    
Financial liabilities [2]
Fair Value, Inputs, Level 1 [Member] | SAFE Agreement with related party [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 1 [Member] | Private placement warrants [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 1 [Member] | Working capital warrants [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 1 [Member] | Public warrants [Member]    
Financial Liabilities    
Financial liabilities 2,475 862
Fair Value, Inputs, Level 1 [Member] | Deferred Sunder Consideration Shares [Member]    
Financial Liabilities    
Financial liabilities 10,840  
Fair Value, Inputs, Level 2 [Member]    
Financial Assets    
Financial assets
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 2 [Member] | Restricted cash [Member]    
Financial Assets    
Financial assets
Fair Value, Inputs, Level 2 [Member] | July 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 2 [Member] | July 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 2 [Member] | September 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 2 [Member] | September 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1]
Fair Value, Inputs, Level 2 [Member] | July 2025 Note derivative liability– related party [Member]    
Financial Liabilities    
Financial liabilities [1]  
Fair Value, Inputs, Level 2 [Member] | September 2025 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1]  
Fair Value, Inputs, Level 2 [Member] | November 2025 Note derivative liability – related party [Member]    
Financial Liabilities    
Financial liabilities [1]  
Fair Value, Inputs, Level 2 [Member] | Forward purchase agreement liabilities [Member]    
Financial Liabilities    
Financial liabilities [2]
Fair Value, Inputs, Level 2 [Member] | SAFE Agreement with related party [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 2 [Member] | Private placement warrants [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 2 [Member] | Working capital warrants [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 2 [Member] | Public warrants [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 2 [Member] | Deferred Sunder Consideration Shares [Member]    
Financial Liabilities    
Financial liabilities  
Fair Value, Inputs, Level 2 [Member] | Deferred Ambia Consideration Shares [Member]    
Financial Liabilities    
Financial liabilities  
Fair Value, Inputs, Level 3 [Member]    
Financial Assets    
Financial assets
Financial Liabilities    
Financial liabilities 118,774 101,699
Fair Value, Inputs, Level 3 [Member] | Restricted cash [Member]    
Financial Assets    
Financial assets
Fair Value, Inputs, Level 3 [Member] | July 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1] 19,604 13,563
Fair Value, Inputs, Level 3 [Member] | July 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1] 12,615 21,127
Fair Value, Inputs, Level 3 [Member] | September 2024 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1] 37,930 55,474
Fair Value, Inputs, Level 3 [Member] | September 2024 Notes derivative liability – related parties [Member]    
Financial Liabilities    
Financial liabilities [1] 5,870 6,958
Fair Value, Inputs, Level 3 [Member] | July 2025 Note derivative liability– related party [Member]    
Financial Liabilities    
Financial liabilities [1] 3,246  
Fair Value, Inputs, Level 3 [Member] | September 2025 Notes derivative liability [Member]    
Financial Liabilities    
Financial liabilities [1] 14,756  
Fair Value, Inputs, Level 3 [Member] | November 2025 Note derivative liability – related party [Member]    
Financial Liabilities    
Financial liabilities [1] 1,488  
Fair Value, Inputs, Level 3 [Member] | Forward purchase agreement liabilities [Member]    
Financial Liabilities    
Financial liabilities 3,965 3,494 [2]
Fair Value, Inputs, Level 3 [Member] | SAFE Agreement with related party [Member]    
Financial Liabilities    
Financial liabilities 535 384
Fair Value, Inputs, Level 3 [Member] | Private placement warrants [Member]    
Financial Liabilities    
Financial liabilities 1,692 627
Fair Value, Inputs, Level 3 [Member] | Working capital warrants [Member]    
Financial Liabilities    
Financial liabilities 194 72
Fair Value, Inputs, Level 3 [Member] | Public warrants [Member]    
Financial Liabilities    
Financial liabilities
Fair Value, Inputs, Level 3 [Member] | Deferred Sunder Consideration Shares [Member]    
Financial Liabilities    
Financial liabilities  
Fair Value, Inputs, Level 3 [Member] | Deferred Ambia Consideration Shares [Member]    
Financial Liabilities    
Financial liabilities $ 16,879  
[1] The derivative liabilities are associated with the Company’s outstanding senior unsecured convertible notes with stated interest rates of 7.0% (the “September 2024 Notes” and “September 2025 Notes”) and 12.0% (the “July 2024 Notes”, “July 2025 Note”, and “November 2025 Note”) all of which are defined in Note 10 – Borrowings and Derivative Liabilities.
[2] Includes $1.3 million due to related parties as of and December 29, 2024.