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Income Taxes - Additional Information (Detail) £ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2018 GBP (£)
Unrecognized tax benefits	$ 0		$ 0	$ 0
Accrued penalties or interest related to uncertain tax positions	$ 0		$ 0	$ 0
Statutory federal corporate income tax rate	21.00%	34.00%	27.50%	34.00%	34.00%
Foreign current income tax benefit					$ 159,000
Changes in valuation allowance	$ 7,166,000		$ (5,385,000)	$ 7,489,000	$ 6,789,000
U.S. Federal [Member]
Operating loss carry forwards	$ 185,900,000
Tax years that remain subject to examination	2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
Operating loss carry forwards, expiration range start dates	2023
Operating loss carry forwards, expiration range end dates	2038
State [Member]
Operating loss carry forwards	$ 144,300,000
Federal And State Tax [Member]
Research and development tax credit carry forwards expiration begin date	2018
Research and development tax credit carry forwards expiration end date	2038
United Kingdom Tax Authority [Member]
Operating loss carry forwards	$ 26,700,000					£ 21.0
Tax years that remain subject to examination	2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
Federal and State Research and Development Tax Credit Carryforward [Member]
Research and development tax credit carry forwards	$ 3,100,000
Icon Bioscience Inc [Member]
Deferred tax asset	6,200,000
Icon Bioscience Inc [Member] | U.S. Federal [Member]
Operating loss carry forwards	$ 49,300,000

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