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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating expenses (income):    
Research and development $ 588,000 $ 9,703,000
General and administrative 3,970,000 4,994,000
Gain on disposal of assets, net (4,736,000)  
Total operating expenses (income) (178,000) 15,495,000
Income (loss) from operations 178,000 (14,701,000)
Interest and other income, net 96,000 165,000
Income (loss) before income taxes 274,000 (14,536,000)
Income tax expenses 14,000 0
Net income (loss) $ 260,000 $ (14,536,000)
Net income (loss) per share attributable to common stockholders, basic $ 0.01 $ (0.46)
Net income (loss) per share attributable to common stockholders, diluted $ 0.01 $ (0.46)
Shares used to compute net income (loss) per share attributable to common stockholders, basic 37,758,416 31,456,090
Shares used to compute net income (loss) per share attributable to common stockholders, diluted 37,984,324 31,456,090
Cash dividends paid per common share $ 0.24  
Contingent Value Rights Agreement    
Operating expenses (income):    
Cash dividends paid per common share $ 0.01  
Collaboration    
Revenue:    
License and collaboration revenue   $ 794,000
Cost of collaboration    
Operating expenses (income):    
Cost of license and collaboration   $ 798,000