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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue:        
Collaboration revenue $ 79,000 $ 4,847,000 $ 1,076,000 $ 14,030,000
Total revenue 79,000 4,847,000 1,076,000 14,030,000
Operating expenses:        
Research and development expense 10,843,000 7,008,000 21,105,000 13,083,000
General and administrative expense 3,098,000 2,229,000 5,990,000 4,803,000
Total operating expenses 13,941,000 9,237,000 27,095,000 17,886,000
Operating loss (13,862,000) (4,390,000) (26,019,000) (3,856,000)
Other (expense) income, net:        
Dividend income 2,000 4,000 3,000 43,000
Interest income 43,000 267,000 131,000 627,000
Interest expense (450,000) 0 (859,000) (128,000)
Other (expense) income, net (2,000) (192,000) (2,000) 153,000
Total other (expense) income, net (407,000) 79,000 (727,000) 695,000
Net loss before provision for income taxes (14,269,000) (4,311,000) (26,746,000) (3,161,000)
Provision for income taxes 0 0 0 0
Net loss $ (14,269,000) $ (4,311,000) $ (26,746,000) $ (3,161,000)
Basic (loss) earnings per common share (USD per share) $ (0.16) $ (0.05) $ (0.30) $ (0.04)
Diluted (loss) earnings per common share (USD per share) $ (0.16) $ (0.05) $ (0.30) $ (0.04)
Weighted-average basic common shares outstanding (in shares) 88,043,447 87,174,533 87,948,440 87,126,847
Weighted-average diluted common shares outstanding (in shares) 88,043,447 87,174,533 87,948,440 87,126,847