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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues [Abstract]    
Total revenue $ 10,244 $ 9,646
Cost and operating expenses:    
Cost of revenue from collaborative arrangements (exclusive of depreciation shown below) (796) (407)
Cost of revenue from related party transactions (exclusive of depreciation shown below) (57) (41)
Research and development expense (17,061) (16,286)
Depreciation expense (1,530) (1,257)
Selling, general and administrative expense (11,037) (16,835)
Total cost and operating expenses (36,398) (42,168)
Loss from operations (26,154) (32,522)
Other income (expense):    
Interest income, net 1,148 214
Other income (expense), net 179 (30,396)
Total other income (expense), net 1,327 (30,182)
Loss before income taxes (24,827) (62,704)
Income tax expense 0 0
Loss from equity method investees, net (681) (608)
Net loss (25,508) (63,312)
Other comprehensive loss:    
Foreign currency translation adjustments 42 (49)
Comprehensive loss (25,466) (63,361)
Unpaid cumulative dividends on preferred stock 0 (4,117)
Net loss allocated to common shareholders $ (25,508) $ (67,429)
Net loss per common share, basic (in dollars per share) $ (0.13) $ (0.58)
Net loss per common share, diluted (in dollars per share) $ (0.13) $ (0.58)
Weighted-average number of common shares outstanding - basic (in shares) 196,974,508 116,530,963
Weighted-average number of common shares outstanding - diluted (in shares) 196,974,508 116,530,963
Collaborative Arrangement    
Revenues [Abstract]    
Total revenue $ 2,223 $ 1,088
Service and Grants | Nonrelated Party    
Revenues [Abstract]    
Total revenue 6,250 7,585
Tangible Products    
Cost and operating expenses:    
Cost of revenue from contracts with customers (exclusive of depreciation shown below) (919) 0
Tangible Products | Nonrelated Party    
Revenues [Abstract]    
Total revenue 863 0
Service    
Cost and operating expenses:    
Cost of revenue from contracts with customers (exclusive of depreciation shown below) (4,998) (7,342)
Service | Related Party    
Revenues [Abstract]    
Total revenue $ 908 $ 973