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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating expenses (income):        
Research and development $ 318,000 $ 1,871,000 $ 906,000 $ 11,574,000
General and administrative 2,225,000 3,844,000 6,195,000 8,838,000
Gain on disposal of assets, net   (57,245,000) (4,736,000) (57,245,000)
Total operating expenses (income) 2,543,000 (51,530,000) 2,365,000 (36,035,000)
Income (loss) from operations (2,543,000) 51,530,000 (2,365,000) 36,829,000
Interest and other income, net 73,000 102,000 169,000 267,000
Income (loss) before income taxes (2,470,000) 51,632,000 (2,196,000) 37,096,000
Income tax expenses 2,000 0 16,000 0
Net income (loss) and comprehensive income (loss) $ (2,472,000) $ 51,632,000 $ (2,212,000) $ 37,096,000
Net income (loss) per share attributable to common stockholders, basic $ (0.07) $ 1.64 $ (0.06) $ 1.18
Net income (loss) per share attributable to common stockholders, diluted $ (0.07) $ 1.64 $ (0.06) $ 1.18
Shares used to compute net income (loss) per share attributable to common stockholders, basic 37,800,121 31,477,053 37,779,384 31,466,630
Shares used to compute net income (loss) per share attributable to common stockholders, diluted 37,800,121 31,482,925 37,779,384 31,469,566
Cash dividends paid per common share     $ 0.24  
Contingent Value Rights Agreement        
Operating expenses (income):        
Cash dividends paid per common share $ 0.11   $ 0.12  
Collaboration        
Revenue:        
License and collaboration revenue       $ 794,000
Cost of collaboration        
Operating expenses (income):        
Cost of license and collaboration       $ 798,000