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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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