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Reverse Merger - Schedule of Purchase Price Consideration (Parenthetical) (Detail)
$ / shares in Units, $ in Thousands
May 11, 2017
May 09, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Business Acquisition [Line Items]        
Common stock outstanding | shares     6,943,832 82,246
Equity | $     $ 23,439 $ (2,702)
Tokai Pharmaceuticals, Inc. [Member]        
Business Acquisition [Line Items]        
Common stock outstanding | shares   2,515,739    
Closing price per share | $ / shares   $ 5.76    
Common stock reverse stock split description One for nine      
Equity | $   $ 21,500    
Premium payment over fair value of common stock based on net tangible asset, rate   1.08    
Reverse Stock Split [Member] | Tokai Pharmaceuticals, Inc. [Member]        
Business Acquisition [Line Items]        
Common stock reverse stock split ratio 0.111111111