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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Statement [Abstract]    
Revenue $ 12,870 $ 10,074
Costs and expenses    
Cost of sales, exclusive of depreciation shown separately below 5,024 5,056
Selling, general and administrative 32,992 34,968
Engineering 14,405 22,197
Depreciation expense 12,655 17,256
Total costs and expenses 65,076 79,477
Operating loss (52,206) (69,403)
Other (expense) income, net    
Interest income, net 970 1,722
Change in fair value of financial instruments (60,071) 6,474
Other (expense) income, net (2,107) 9,271
Total other (expense) income, net (61,208) 17,467
Loss before income tax (113,414) (51,936)
Income tax expense (2,858) (9,082)
Net loss available to stockholders (116,272) (61,018)
Other comprehensive loss    
Foreign currency translation gain (loss), net of tax (538) 279
Comprehensive loss $ (116,810) $ (60,739)
Basic and diluted earnings per share    
Basic loss per share for the period attributable to stockholders (in dollars per share) $ (1.28) $ (0.68)
Basic weighted-average common shares outstanding (in shares) 91,164,286 89,539,910
Diluted loss per share for the period attributable to stockholders (in dollars per share) $ (1.28) $ (0.68)
Diluted weighted-average common shares outstanding (in shares) 91,164,286 89,539,910