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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating expenses:      
Research and development $ 37,879,325 $ 20,950,672 $ 14,194,732
General and administrative 14,931,887 8,593,626 2,294,671
Total operating expenses 52,811,212 29,544,298 16,489,403
Other income (expense):      
Interest income (expense) 222,652 156,351 (182)
Foreign currency (loss) gain (890,252) 1,328,140 961,316
Total other (expense) income (667,600) 1,484,491 961,134
Net loss (53,478,812) (28,059,807) (15,528,269)
Other comprehensive loss:      
Foreign currency translation 1,496,517 (2,772,453) (473,919)
Total comprehensive loss $ (51,982,295) $ (30,832,260) $ (16,002,188)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (2.53) $ (4.67) $ (13.45)
Weighted-average common shares outstanding, basic and diluted (in shares) 21,133,651 6,002,486 1,154,368