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Reverse Merger - Summary of Allocation of Estimated Purchase Price to Acquired Assets and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
May 09, 2017
Business Acquisition [Line Items]    
Goodwill $ 1,867  
Tokai Pharmaceuticals, Inc. [Member]    
Business Acquisition [Line Items]    
Cash, cash equivalents, and restricted cash   $ 23,250
Prepaids and other current assets   1,132
Property and equipment   73
Goodwill   1,867
Accounts payable, accrued expenses and other liabilities   (2,947)
Net assets acquired   $ 23,375