XML 68 R31.htm IDEA: XBRL DOCUMENT v3.7.0.1
Reverse Merger (Details) - USD ($)
Jul. 22, 2016
Jul. 21, 2016
Dec. 31, 2016
Dec. 31, 2015
Reverse Merger        
Shares outstanding     11,951,866 176,158
Common stock received     11,951,866 176,158
Merged Company        
Reverse Merger        
Success fee settled in cash $ 750,000      
Success fee settled for both parties in shares $ 750,000      
Merged Company | Stockholders        
Reverse Merger        
Voting interest acquired 64.00% 64.00%    
Merged Company        
Reverse Merger        
Number of shares issued for each share of private Madrigal stock 0.1593      
Shares outstanding   11,300,000    
Merged Company | Synta Pharmaceuticals Corp        
Reverse Merger        
Number of shares of the combined company to be owned by Synta stockholders 4,032,734      
Multiplied by the fair value of Synta common stock $ 9.48      
Purchase price $ 38,236,000      
Synta Pharmaceuticals Corp        
Reverse Merger        
Reverse stock split   0.02857    
Multiplied by the fair value of Synta common stock   $ 9.48    
Closing stock price (in dollars per share)   $ 0.2709    
Synta Pharmaceuticals Corp | Stockholders        
Reverse Merger        
Shares outstanding 3,937,309      
Unvested restricted common stock 95,425      
Synta Pharmaceuticals Corp | Madrigal Pharmaceuticals, Inc        
Reverse Merger        
Common stock received 7,253,655