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Description of Business - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 11, 2017 | May 09, 2017 $ / shares shares | Jan. 31, 2017 $ / shares shares | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, reverse stock splits |  | 836,857 |  |  |  |  |  |
Net loss | $ |  |  |  | $ (6,662) | $ (1,002) | $ (8,036) | $ (2,105) |
Working capital | $ |  |  |  | 21,700 |  | 21,700 |  |
Accumulated deficit | $ |  |  |  | $ (22,426) |  | $ (22,426) |  | $ (14,390)
Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Number of shares Issued under Stock purchase agreement |  |  | 4,000,000 |  |  |  |  |
Tokai Pharmaceuticals Inc [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Number of shares Issued under Stock purchase agreement |  |  | 400,400 |  |  |  |  |
Price of shares Issued under Stock purchase agreement | $ / shares |  |  | $ 9.99 |  |  |  |  |
Tokai Pharmaceuticals, Inc. [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, reverse stock splits |  | 4,027,693 |  |  |  |  |  |
Common stock and options for common stock reverse stock split description | One for nine |  |  |  |  |  |  |
Price of shares Issued under Stock purchase agreement | $ / shares |  | $ 5.76 |  |  |  |  |  |
Tokai Pharmaceuticals, Inc. [Member] | Reverse Stock Split [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Stock conversion, conversion ratio | 0.111111111 |  |  |  |  |  |  |
Otic Pharma [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% |  | 100.00% |  |
Common stock and options for common stock reverse stock split description | One-for-nine | One-for-nine |  |  |  |  |  |
Percentage of ownership |  |  | 64.00% |  |  |  |  |
Otic Pharma [Member] | Reverse Stock Split [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Stock conversion, conversion ratio | 0.111111111 | 0.111111111 |  |  |  |  |  |
Otic Pharma, Inc. [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% |  | 100.00% |  |

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