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Segment Information - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]            
Revenue $ 4,440   $ 3,501   $ 7,827 $ 6,829
Cost of sales excluding depreciation (1,189)   (1,249)   (2,426) (2,554)
Selling, general and administrative expenses (5,361)   (9,541)   (11,846) (18,930)
Engineering (2,327)   (4,287)   (4,820) (8,674)
Net loss available to stockholders (6,652) $ (32,581) (18,101) $ (15,178) (39,233) (33,279)
Reportable Segment            
Segment Reporting Information [Line Items]            
Revenue 4,440   3,501   7,827 6,829
Cost of sales excluding depreciation (1,189)   (1,249)   (2,426) (2,554)
Selling, general and administrative expenses (5,361)   (9,541)   (11,846) (18,930)
Engineering (2,327)   (4,287)   (4,820) (8,674)
Other segment items (2,215)   (6,525)   (27,968) (9,950)
Net loss available to stockholders $ (6,652)   $ (18,101)   $ (39,233) $ (33,279)