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Galectin Science LLC - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2014
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]                
Equity method investment in Galectin Sciences LLC             $ 400,000  
Loss from equity method investment in Galectin Sciences, LLC         $ (67,000)   $ (337,000)  
Galectin Sciences, LLC                
Investments in and Advances to Affiliates [Line Items]                
Equity method investment in Galectin Sciences LLC $ 400,000              
Subsequent capital contribution   $ 172,000 $ 159,000 $ 93,000        
Equity Method Investment, Ownership Percentage 50.00%              
Ownership Percentage           67.30%    
Loss from equity method investment in Galectin Sciences, LLC               $ (400,000)
Non-cash charge for in-process research and development               $ 200,000
Galectin Sciences, LLC | 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