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Galectin Science LLC - Additional Information (Detail) - Galectin Sciences, LLC - USD ($)
1 Months Ended 3 Months Ended 39 Months Ended
Jan. 31, 2014
Mar. 31, 2018
Mar. 31, 2018
Investments in and Advances to Affiliates [Line Items]      
Equity method investment in Galectin Sciences LLC $ 400,000    
Subsequent capital contribution   $ 23,000 $ 1,663,000
Equity Method Investment, Ownership Percentage 50.00% 79.80% 79.80%
SBH Sciences, Inc      
Investments in and Advances to Affiliates [Line Items]      
Subsequent capital contribution     $ 123,000
Ownership Percentage   79.80%  
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