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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating expenses    
Research and development $ (31,801,880) $ (42,048,954)
General and administrative (22,321,216) (23,012,463)
Total operating expenses (54,123,096) (65,061,417)
Operating loss (54,123,096) (65,061,417)
Other income, net 10,138,367 591,732
Loss before income tax (43,984,729) (64,469,685)
Income tax expense (94,388) (36,366)
Net loss (44,079,117) (64,506,051)
Of which: net loss attributable to controlling interests shareholders (36,007,260) (49,973,249)
Of which: net loss attributable to noncontrolling interests shareholders (8,071,857) (14,532,802)
Net unrealized gain on marketable securities and short-term investments 2,330,101 390,753
Actuarial income (loss) on employee benefit plans (336,579) 269,893
Other comprehensive income 1,993,522 660,646
Comprehensive loss (42,085,595) (63,845,405)
Comprehensive loss attributable to controlling interests shareholders (34,511,723) (49,437,461)
Comprehensive loss attributable to noncontrolling interests $ (7,573,872) $ (14,407,944)
Weighted-average number of shares, basic (in shares) 49,122,534 29,361,353
Weighted-average number of shares, diluted (in shares) 49,122,534 29,361,353
Basic net loss per share attributable to controlling interest shareholders (USD per share) $ (0.73) $ (1.70)
Diluted net loss per share attributable to controlling interest shareholders (USD per share) $ (0.73) $ (1.70)
Common Class A    
Operating expenses    
Weighted-average number of shares, basic (in shares) 49,122,534 29,361,353
Weighted-average number of shares, diluted (in shares) 49,122,534 29,361,353
Basic net loss per share attributable to controlling interest shareholders (USD per share) $ (0.73) $ (1.70)
Diluted net loss per share attributable to controlling interest shareholders (USD per share) $ (0.73) $ (1.70)