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Notes Payable - Schedule of Notes Payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jul. 14, 2025
Mar. 21, 2025
Dec. 31, 2024
Nonrelated Party        
Debt Instrument [Line Items]        
Notes payable, current portion $ 7,450     $ 4,224
Notes payable, long-term portion 71,452     45,264
Notes Payable        
Debt Instrument [Line Items]        
Unpaid Principal Balance 98,153     50,577
Fair Value Measurement Adjustments 2,349     27,399
Original Issue Discount and Proceeds Allocated to Warrants (21,600)     (28,488)
Net Carrying Value 78,902     49,488
Secured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Unpaid Principal Balance       3,118
Fair Value Measurement Adjustments       2,651
Original Issue Discount and Proceeds Allocated to Warrants       (312)
Net Carrying Value       5,457
2023 Unsecured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Unpaid Principal Balance 8,100     4,380
Fair Value Measurement Adjustments 203     2,844
Original Issue Discount and Proceeds Allocated to Warrants (810)     (508)
Net Carrying Value $ 7,493     $ 6,716
Junior Secured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 10.00%     10.00%
Unpaid Principal Balance $ 18,000     $ 28,840
Fair Value Measurement Adjustments (471)     13,163
Original Issue Discount and Proceeds Allocated to Warrants 0     (15,944)
Net Carrying Value $ 17,529     $ 26,059
2024 Unsecured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 10.00%     10.00%
Unpaid Principal Balance $ 9,070     $ 10,015
Fair Value Measurement Adjustments 756     8,741
Original Issue Discount and Proceeds Allocated to Warrants 0     (11,724)
Net Carrying Value $ 9,826     $ 7,032
2025 March Unsecured SPA Notes        
Debt Instrument [Line Items]        
Contractual Interest Rates     10.00%  
2025 March Unsecured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 10.00%   18.00%  
Unpaid Principal Balance $ 16,188      
Fair Value Measurement Adjustments 3,503      
Original Issue Discount and Proceeds Allocated to Warrants (12,479)      
Net Carrying Value $ 7,212      
2025 July Unsecured SPA Notes        
Debt Instrument [Line Items]        
Contractual Interest Rates   10.00%    
2025 July Unsecured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 10.00% 18.00%    
Unpaid Principal Balance $ 39,200      
Fair Value Measurement Adjustments (1,872)      
Original Issue Discount and Proceeds Allocated to Warrants (7,936)      
Net Carrying Value $ 29,392      
Notes payable – China other | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 0.00%     0.00%
Unpaid Principal Balance $ 4,213     $ 4,173
Fair Value Measurement Adjustments 0     0
Original Issue Discount and Proceeds Allocated to Warrants 0     0
Net Carrying Value $ 4,213     $ 4,173
2025 Convertible Note - AIXC | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 0.00%      
Unpaid Principal Balance $ 132      
Fair Value Measurement Adjustments 230      
Original Issue Discount and Proceeds Allocated to Warrants (22)      
Net Carrying Value $ 340      
Promissory Notes - AIXC        
Debt Instrument [Line Items]        
Contractual Interest Rates 30.00%      
Unpaid Principal Balance $ 2,900      
Net Carrying Value $ 3,300      
Promissory Notes - AIXC | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 0.00%      
Unpaid Principal Balance $ 3,250      
Fair Value Measurement Adjustments 0      
Original Issue Discount and Proceeds Allocated to Warrants (353)      
Net Carrying Value $ 2,897      
Auto loans | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates       7.00%
Unpaid Principal Balance       $ 51
Fair Value Measurement Adjustments       0
Original Issue Discount and Proceeds Allocated to Warrants       0
Net Carrying Value       $ 51
Minimum | Secured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 10.00%     10.00%
Minimum | 2023 Unsecured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 10.00%     10.00%
Minimum | Promissory Notes - AIXC        
Debt Instrument [Line Items]        
Contractual Interest Rates 88.78%      
Maximum | Secured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 15.00%     15.00%
Maximum | 2023 Unsecured SPA Notes | Notes Payable        
Debt Instrument [Line Items]        
Contractual Interest Rates 15.00%     15.00%
Maximum | Promissory Notes - AIXC        
Debt Instrument [Line Items]        
Contractual Interest Rates 98.80%