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Income Taxes - Additional Information (Detail) £ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017	Jun. 30, 2017 USD ($)	Dec. 31, 2019 GBP (£)
Statutory federal corporate income tax rate	21.00%	21.00%	27.50%		34.00%
Changes in valuation allowance	$ 7,166,000	$ 15,608,000		$ (5,385,000)		$ 7,489,000
Change in valuation allowance due to impact of 2017 Tax Act				765,000
Unrecognized tax benefits		0
Accrued penalties or interest related to uncertain tax positions	$ 0	0	$ 0
U.S. Federal [Member]
Operating loss carry forwards		236,600,000
Net operating loss carry forwards		$ 151,800,000
Operating loss carry forwards, expiration range start dates		2023
Operating loss carry forwards, expiration range end dates		2038
Tax years that remain subject to examination		2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
State [Member]
Operating loss carry forwards		$ 190,100,000
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
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
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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