Related Party Agreements - Additional Information (Detail)	1 Months Ended											3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	May 31, 2019 USD ($)	Aug. 31, 2018 USD ($)	Apr. 30, 2017 USD ($)	Sep. 30, 2016 USD ($) ft²	Apr. 30, 2016 USD ($)	Mar. 31, 2016	Nov. 30, 2015 USD ($) ft²	Jun. 30, 2015	Jun. 30, 2020 USD ($) ft² Officer	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) ft² Officer	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Selling, general and administrative expense												$ 6,519,000		$ 4,182,000	$ 11,892,000	$ 9,924,000
Research and development												13,709,000		13,131,000	26,943,000	25,729,000
Due to related parties												2,228,000			2,228,000		$ 486,000
Operating expenses												20,228,000		17,313,000	38,835,000	35,653,000
Due from related parties												$ 26,000			26,000		47,000
Joint COVID-19 Collaboration
Related Party Transaction [Line Items]
Capital expenditures for laboratory equipment															2,300,000
Operating and capital expenditures															4,500,000
Joint COVID-19 Collaboration | Estimated Personnel Costs, Laboratory Supplies, and Other Expenses
Related Party Transaction [Line Items]
Operating expenses															$ 5,400,000
NantWorks
Related Party Transaction [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
NantWorks | Research and Development
Related Party Transaction [Line Items]
Lease expense												$ 200,000		200,000	$ 300,000	300,000
NantWorks | Shared Services Agreement
Related Party Transaction [Line Items]
Selling, general and administrative expense												600,000		500,000	1,300,000	1,200,000
Research and development												400,000		300,000	1,000,000.0	600,000
NantWorks | Shared Services Agreement | Reimbursements
Related Party Transaction [Line Items]
Selling, general and administrative expense												400,000		200,000	700,000	400,000
Research and development												300,000		600,000	800,000	1,100,000
Due to related parties												800,000			800,000		400,000
Immuno-Oncology Clinic, Inc. | California
Related Party Transaction [Line Items]
Research and development												100,000		200,000	200,000	500,000
Due to related parties												$ 100,000			$ 100,000		100,000
Number of officers | Officer												1			1
Initial term of agreement			1 year
Related party transaction installment payment		$ 1,875,000	$ 3,750,000
Related party transaction conditional payment												$ 1,875,000			$ 1,875,000
Prepayments remain unearned extension description															To the extent any portion of the prepayments remain unearned by the Clinic on the third anniversary of the new agreement, we may elect at our sole discretion either to (i) not extend the term of the new agreement and have the Clinic reimburse us for the total amount of any remaining unused portion of the prepayments, or (ii) extend the term of the new agreement for up to three additional one year periods, at which time the Clinic will reimburse us for the total amount of any remaining unused portion of the prepayments plus interest if reimbursement is not made within 60 days of expiration.
Notice period to terminate new agreement															60 days
Prepaid balance included in prepaid expenses and other current assets and other assets												4,900,000			$ 4,900,000		5,100,000
Immuno-Oncology Clinic, Inc. | California | Maximum
Related Party Transaction [Line Items]
Estimated cost for new agreement with clinic													$ 7,500,000
ImmunityBio
Related Party Transaction [Line Items]
Research and development												100,000		5,000	100,000	100,000
Due to related parties												1,300,000			1,300,000
Initial term of agreement entered into with the related party by the entity											5 years
Related party, agreement renewal term											1 year
Related parties, capitalized equipment amount															3,100,000		1,800,000
Prepaid expenses and other current assets												300,000			300,000		500,000
Due between parties																	0
ImmunityBio | Collaborative Arrangement
Related Party Transaction [Line Items]
Research and development												29,700			100,000
Related party, agreement renewal term											1 year
ImmunityBio | Collaborative Arrangement | Prepaid Expenses and Other Current Assets
Related Party Transaction [Line Items]
Due from related parties												29,700			29,700
Altor
Related Party Transaction [Line Items]
Supplies and milestone charges for conducting clinical trials												0		0	0	0
Doug St, LLC
Related Party Transaction [Line Items]
Due between parties												0			$ 0		0
Period of agreement															The lease runs from July 2016 through July 2023.
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
Related Party Transaction [Line Items]
Number of square foot of facility leased | ft²							24,250
Doug St, LLC | Research and Development
Related Party Transaction [Line Items]
Lease expense												200,000		400,000	$ 200,000	400,000
NantBioScience
Related Party Transaction [Line Items]
Research and development												200,000		$ 300,000	$ 200,000	$ 300,000
Estimated cost for new agreement with clinic					$ 1,400,000
Initial term of agreement entered into with the related party by the entity					10 years				5 years
Related party transaction,reimbursement payment to a related-party					$ 900,000
Related party transaction, amount paid to third-party					500,000
Related party transaction, aggregate value					$ 1,400,000
Related party agreement expiration date					2027-06
Research and development expense, ratable payment period															12 months
Prepayment for services amount	$ 600,000			$ 600,000	$ 600,000	$ 600,000		$ 600,000
NantBioScience | Prepaid Expenses and Other Current Assets
Related Party Transaction [Line Items]
Research and development															$ 400,000		100,000
Due between parties												$ 0			$ 0		$ 8,400