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Commitment and Contingencies - Additional Information (Detail)	1 Months Ended				3 Months Ended
	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($) ft²	Nov. 30, 2015 USD ($) ft²	Sep. 30, 2015 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)
Commitments And Contingencies [Line Items]
Rent expense					$ 700,000	$ 700,000
Non cash build to suit lease asset					$ 5,100,000
Doug St, LLC
Commitments And Contingencies [Line Items]
Period of agreement					The lease runs from July 2016 through July 2023. The Company has the option to extend the lease for an additional three year term through July 2026. The monthly rent is $0.1 million with annual increases of 3% beginning in July 2017.
Optional extended lease term		3 years
Base rent - monthly		$ 100,000
Percentage of annual increase of base rent		3.00%
Annual percentage increases to base rent commencement date		Jul. 31, 2017
Costs incurred					$ 30,100,000
Non cash build to suit lease asset					5,100,000
Property and equipment estimated useful lives		39 years
Doug St, LLC | El Segundo California
Commitments And Contingencies [Line Items]
Number of square foot of facility leased | ft²		24,250
Doug St, LLC | Research and Development
Commitments And Contingencies [Line Items]
Rent expense					$ 100,000	100,000
NantWorks
Commitments And Contingencies [Line Items]
Number of square foot of facility leased | ft²			9,500
Period of agreement					The license was effective in May 2015 and extends through December 2020. The Company has the option to extend the license through December 2023. The monthly license fee is $47,000 with annual increases of 3% beginning in January 2017.
Base rent - monthly			$ 47,000
Percentage of annual increase of base rent			3.00%
Annual percentage increases to base rent commencement date			Jan. 31, 2017
Costs incurred							$ 3,500,000
Property and equipment estimated useful lives			39 years
Accumulated depreciation on building					$ 4,300,000
NantWorks | Research and Development
Commitments And Contingencies [Line Items]
Rent expense					47,000	$ 47,000
Prepaid Expenses and Current Assets
Commitments And Contingencies [Line Items]
Insurance claim receivable					$ 1,600,000
USPTO
Commitments And Contingencies [Line Items]
Attorney's fees and expert witness fees				$ 100,000
Award amount in favour to other party	$ 100,000

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