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Galectin Science LLC - Additional Information (Detail) - Galectin Sciences, LLC - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2014
Jun. 30, 2021
Dec. 31, 2014
Jun. 30, 2021
Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]          
Equity method investment in Galectin Sciences LLC $ 400,000        
Subsequent capital contribution   $ 73,000 $ 2,529,000    
Equity Method Investment, Ownership Percentage 50.00%        
Proceeds from Sale of Equity Method Investments         $ 400,000
SBH Sciences, Inc          
Investments in and Advances to Affiliates [Line Items]          
Subsequent capital contribution       $ 158,000  
SBH Sciences, Inc | In Process Research and Development          
Investments in and Advances to Affiliates [Line Items]          
Estimated fair value of the IPR&D Contributed by SBH $ 400,000        
Ownership Percentage       84.00%