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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 |  |  |

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