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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Collaboration revenue $ 10,732,000 $ 6,920,000 $ 31,096,000 $ 18,449,000
Operating expenses:        
Research and development 27,149,000 28,744,000 83,859,000 76,815,000
General and administrative 9,209,000 8,099,000 26,397,000 22,138,000
Total operating expenses 36,358,000 36,843,000 110,256,000 98,953,000
Loss from operations (25,626,000) (29,923,000) (79,160,000) (80,504,000)
Other income:        
Interest income 1,872,000 350,000 4,383,000 865,000
Other income, net 1,514,000 523,000 3,883,000 526,000
Total other income, net 3,386,000 873,000 8,266,000 1,391,000
Loss before income taxes (22,240,000) (29,050,000) (70,894,000) (79,113,000)
Provision for income taxes (23,000) 0 (87,000) (3,000)
Net loss $ (22,263,000) $ (29,050,000) $ (70,981,000) $ (79,116,000)
Net loss per common share - basic $ (0.23) $ (0.33) $ (0.78) $ (0.90)
Net loss per common share - diluted $ (0.23) $ (0.33) $ (0.78) $ (0.90)
Weighted average number of common shares outstanding - basic 97,033,273 87,892,195 91,268,133 87,868,081
Weighted average number of common shares outstanding - diluted 97,033,273 87,892,195 91,268,133 87,868,081
Net loss $ (22,263,000) $ (29,050,000) $ (70,981,000) $ (79,116,000)
Other comprehensive income (loss):        
Unrealized gain (loss) on marketable securities 836,000 (509,000) 3,024,000 (4,091,000)
Comprehensive loss (21,427,000) (29,559,000) (67,957,000) (83,207,000)
Collaboration Revenue [Member]        
Collaboration revenue $ 10,732,000 $ 6,920,000 26,096,000 $ 18,449,000
License Revenue [Member]        
Collaboration revenue     $ 5,000,000