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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Revenue        
Total revenue $ 1,007 $ 549 $ 1,554 $ 3,856
Costs and expenses        
Cost of revenue (exclusive of depreciation and amortization) 327 306 579 3,656
Research and development 13,118 4,094 25,094 18,115
Selling, general and administrative 13,357 3,988 22,413 17,303
Depreciation and amortization 191 253 886 2,040
Loss on purchase commitments     0 1,165
Transaction costs 12,035 45 217 105
Total operating expenses 39,028 8,686 49,189 42,384
Loss from operations (38,021) (8,137) (47,635) (38,528)
Other expense, net        
Pay-to-Play financing charge     0 (35,832)
Debt financing charge on convertible notes     (464) (3,145)
Other, net (19) (229) 1,903 (255)
Loss on foreign exchange transactions (29) (49) (228) 50
Change in fair value of convertible notes (165,703) (4,651) (10,022) (9,532)
Change in fair value of warrant liabilities (60,345) (3,515) (5,701) (945)
Change in fair value of earnout share liabilities 116,518      
Total other income (expense), net (109,578) (8,444) (14,512) (49,659)
Total loss before income taxes (147,599) (16,581) (62,147) (88,187)
Provision for income taxes 162 162 (952) (598)
Net loss $ (147,761) $ (16,743) $ (61,195) $ (87,589)
Net loss per share - basic $ (1.61) $ (1.23) $ (3.5) $ (20.79)
Net loss per share - diluted $ (1.61) $ (1.23) $ (3.5) $ (20.79)
Weighted average number of shares outstanding - basic 91,747,685 13,613,270 17,476,105 4,213,244
Weighted average number of shares outstanding - diluted 91,747,685 13,613,270 17,476,105 4,213,244
Hardware revenue        
Revenue        
Total revenue $ 1,007 $ 3 $ 29 $ 16
Related Party | Engineering services revenue        
Revenue        
Total revenue   $ 546 $ 1,525 $ 3,840