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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]    
Revenue $ 3,387 $ 3,328
Costs and expenses    
Cost of sales, exclusive of depreciation shown separately below 1,237 1,305
Selling, general and administrative 6,485 9,389
Engineering 2,493 4,387
Depreciation expense 2,687 2,845
Total costs and expenses 12,902 17,926
Operating loss (9,515) (14,598)
Other (expense) income, net    
Interest income, net 177 204
Change in fair value of financial instruments (22,361) (752)
Other (expense) income, net (167) 1,401
Total other (expense) income, net (22,351) 853
Loss before income tax (31,866) (13,745)
Income tax expense (715) (1,433)
Net loss available to stockholders (32,581) (15,178)
Other comprehensive gain (loss)    
Foreign currency translation gain (loss), net of tax 257 (137)
Comprehensive loss $ (32,324) $ (15,315)
Basic and diluted earnings per share    
Basic net loss per share for the period attributable to holders of Common Stock (in dollars per share) $ (0.34) $ (0.17)
Basic weighted-average Common Stock outstanding (in shares) 96,655,349 90,331,496
Diluted loss per share for the period attributable to stockholders (in dollars per share) $ (0.34) $ (0.17)
Diluted weighted-average Common Stock outstanding (in shares) 96,655,349 90,331,496