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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating expenses (income):    
Research and development $ 13,037 $ 68,889
General and administrative 17,366 18,963
Acquired in-process research and development 35,390  
Gain on disposal of assets, net (57,186)  
Total operating expenses 9,405 95,232
Loss from operations (8,611) (87,894)
Interest and other income (expense), net 717 (39)
Loss before income taxes (7,894) (87,933)
Income tax expenses 348  
Net loss $ (8,242) $ (87,933)
Net loss per share attributable to common stockholders, basic $ (0.26) $ (2.87)
Net loss per share attributable to common stockholders, diluted $ (0.26) $ (2.87)
Shares used to compute net loss per share attributable to common stockholders, basic 31,545,723 30,640,977
Shares used to compute net loss per share attributable to common stockholders, diluted 31,545,723 30,640,977
Cash dividends paid per common share $ 1.43  
Cash dividends declared, unpaid, per common share $ 0.24  
Collaboration    
Revenue:    
License and collaboration revenue $ 794 $ 7,338
Cost of collaboration    
Operating expenses (income):    
Cost of license and collaboration $ 798 $ 7,380