Subsequent Events - Additional Information (Detail) - Collaborative Arrangement - USD ($)	6 Months Ended
Jun. 30, 2020	Jun. 22, 2020
ImmunityBio
Subsequent Event [Line Items]
Expect joint study cost		$ 11,800,000
Agreement expiry date	Jun. 22, 2022
Immuno-Oncology Clinic, Inc. \| Maximum
Subsequent Event [Line Items]
Expected clinical trial expenses		$ 3,700,000

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration