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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenues [Abstract]    
Total revenues $ 49,592 $ 62,631
Costs and operating expenses:    
Collaborative arrangements [1] 2,566 2,265
Related party transactions [1] 520 172
Research and development expense 77,007 68,142
Depreciation expense 5,567 5,452
Selling, general and administrative expense 49,981 50,438
Total cost and operating expenses 158,525 169,011
Loss from operations (108,933) (106,380)
Other income (expense):    
Interest income, net 3,162 4,572
Other expense, net (17,726) (29,388)
Total other expense, net (14,564) (24,816)
Loss before income taxes (123,497) (131,196)
Loss from equity method investees, net (14,234) (2,902)
Net loss (137,731) (134,098)
Other comprehensive loss:    
Changes in credit risk of fair value instruments (1,096) 0
Foreign currency translation adjustments 124 (376)
Comprehensive loss (138,703) (134,474)
Unpaid cumulative dividends on preferred stock 0 (4,117)
Net loss allocated to common shareholders $ (137,731) $ (138,215)
Net loss per common share - basic (in usd per share) $ (0.70) $ (0.79)
Net loss per common share - diluted (in usd per share) $ (0.70) $ (0.79)
Weighted-average number of common shares outstanding - basic (in shares) 197,579,945 176,023,219
Weighted-average number of common shares outstanding - diluted (in shares) 197,579,945 176,023,219
Collaborative arrangements    
Revenues [Abstract]    
Total revenues $ 5,573 $ 5,529
Service and Grants    
Costs and operating expenses:    
Cost of revenue from contracts with customers [1] 15,341 37,653
Service and Grants | Nonrelated Party    
Revenues [Abstract]    
Total revenues 22,995 45,953
Tangible Products    
Costs and operating expenses:    
Cost of revenue from contracts with customers [1] 7,543 4,889
Tangible Products | Nonrelated Party    
Revenues [Abstract]    
Total revenues 7,943 5,337
Service | Related Party    
Revenues [Abstract]    
Total revenues $ 13,081 $ 5,812
[1] exclusive of depreciation