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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue:        
Collaboration revenue $ 0 $ 2,471,000 $ 0 $ 5,036,000
Total revenue 0 2,471,000 0 5,036,000
Operating expenses:        
Research and development expense 0 6,749,000 1,423,000 13,889,000
General and administrative expense 5,642,000 3,205,000 8,758,000 6,367,000
Total operating expenses 5,642,000 9,954,000 10,181,000 20,256,000
Operating loss (5,642,000) (7,483,000) (10,181,000) (15,220,000)
Other income (expense), net:        
Dividend income 15,000 16,000 32,000 18,000
Interest income 13,000 1,000 24,000 3,000
Interest expense 0 0 0 (595,000)
Other income (expense), net (150,000) (4,000) (46,000) (24,000)
Total other income (expense), net (122,000) 13,000 10,000 (598,000)
Net loss before provision for income taxes (5,764,000) (7,470,000) (10,171,000) (15,818,000)
Provision for income taxes 0 0 0 0
Net loss $ (5,764,000) $ (7,470,000) $ (10,171,000) $ (15,818,000)
Basic loss per common share (in dollars per share) $ (0.68) $ (1.66) $ (1.38) $ (3.71)
Diluted loss per common share (in dollars per share) $ (0.68) $ (1.66) $ (1.38) $ (3.71)
Weighted-average basic common shares outstanding (in shares) 8,432,394 4,503,983 7,366,594 4,268,955
Weighted-average diluted common shares outstanding (in shares) 8,432,394 4,503,983 7,366,594 4,268,955