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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Collaboration revenue $ 5,766 $ 5,758
Operating expenses:    
Research and development 28,039 24,330
General and administrative 8,013 6,807
Total operating expenses 36,052 31,137
Loss from operations (30,286) (25,379)
Other income (expense):    
Interest income 1,061 218
Other income (expense), net 1,217 (47)
Total other income, net 2,278 171
Net loss $ (28,008) $ (25,208)
Net loss per common share - basic $ (0.32) $ (0.29)
Net loss per common share - diluted $ (0.32) $ (0.29)
Weighted average number of common shares outstanding - basic 88,193,917 87,670,653
Weighted average number of common shares outstanding - diluted 88,193,917 87,670,653
Net loss $ (28,008) $ (25,208)
Other comprehensive income (loss):    
Unrealized gain (loss) on marketable securities 1,504 (2,645)
Comprehensive loss $ (26,504) $ (27,853)