Commitments and Contingencies - Additional Information (Detail)			1 Months Ended							3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 01, 2021 USD ($)	Aug. 09, 2019 USD ($)	Aug. 31, 2019	Aug. 31, 2018 USD ($)	Sep. 30, 2016 USD ($) ft²	Jun. 30, 2016 USD ($) ft² $ / ft²	Mar. 31, 2016 ft²	Nov. 30, 2015 USD ($) ft²	Jun. 30, 2015 USD ($) ft²	Jun. 30, 2020 USD ($) ft²	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)
Commitments And Contingencies [Line Items]
Litigation settlement amount													$ 12,000,000.0
Attorney's fee to plaintiffs		$ 500,000
Weighted average remaining lease term										4 years 1 month 6 days			4 years 1 month 6 days			4 years 6 months
Weighted average discount rate										9.00%			9.00%			9.00%
Cash outflows from operating leases excluding variable lease cost										$ 1,100,000		$ 1,000,000.0	$ 2,100,000	$ 2,300,000
Woburn, Massachusetts
Commitments And Contingencies [Line Items]
Number of square foot of facility leased | ft²						8,153	7,893
Base rent - monthly						$ 19,000
Initial term of lease arrangement							48 months
Lease commencement date							Apr. 29, 2016
Addition to number of square foot of facility leased | ft²						260
Annual increase of base rent | $ / ft²						1
Optional extended lease term			2 years
Lease agreement extended lease period			May 31, 2022
Increase in operating lease right-of-use assets											$ 600,000
Period of agreement													In June 2016, the lease was amended to add 260 square feet, for a total of 8,153 square feet. Base rent for the initial term of the lease was $19,000 per month with a $1 per square foot annual increase on each anniversary date.
Woburn, Massachusetts | Forecast
Commitments And Contingencies [Line Items]
Base rent - monthly	$ 25,800
Percentage of annual increase of base rent	3.00%
Commitment; San Diego
Commitments And Contingencies [Line Items]
Number of square foot of facility leased | ft²									44,700
Base rent - monthly									$ 200,000
Percentage of annual increase of base rent									3.00%
Initial term of lease arrangement									7 years
NantBioScience
Commitments And Contingencies [Line Items]
Reimbursed upfront payment to third-party				$ 900,000
Related party transaction, amount paid to third-party				500,000
Related party transaction, aggregate value				$ 1,400,000
Initial term of agreement entered into with the related party by the entity				10 years			5 years
Related party agreement expiration date				2027-06
Doug St, LLC
Commitments And Contingencies [Line Items]
Period of agreement													The lease runs from July 2016 through July 2023. We have 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
Doug St, LLC | El Segundo California
Commitments And Contingencies [Line Items]
Number of square foot of facility leased | ft²					24,250
NantWorks
Commitments And Contingencies [Line Items]
Number of square foot of facility leased | ft²								9,500		9,500			9,500
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
Period of agreement													The license was effective in May 2015 and extends through December 2020. The monthly rent is $47,000, with annual increases of 3% beginning in January 2017.
Prepaid Expenses and Other Current Assets
Commitments And Contingencies [Line Items]
Insurance claim receivable										$ 0			$ 0			$ 34,000
Directors and Officers Insurance Policy
Commitments And Contingencies [Line Items]
Litigation settlement amount													10,800,000
Selling, General and Administrative
Commitments And Contingencies [Line Items]
Litigation settlement amount															$ 1,200,000
Operating Expenses
Commitments And Contingencies [Line Items]
Operating lease expense										1,300,000		1,300,000	2,600,000	2,500,000
Variable lease costs										$ 300,000		$ 300,000	$ 700,000	$ 500,000