Leases - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Sublease, description of option to extend	lease amendment that provided for additional office space in Davis, CA, and extended the term through April 2025, with one option to renew for an additional five-year term. The Company initially expected to exercise its options to renew, and in accordance with ASC 842, Leases, accounted for the amendment and expected renewal as a lease modification and remeasured the operating lease liability.
Operating Lease, Liability	$ 2,017,000	$ 3,294,000
Right of use assets	$ 1,848,000	3,081,000
Existence of option to extend	true
Lease option to extend, description	Some leases (the Davis and Dallas offices, a warehouse, and a copy machine) include one or more options to renew, with renewal terms that can extend the lease term from one to six years
Operating lease term, expiration	2024-05
Early termination fees	$ 47,000
Minimum [Member]
Lessee Lease Description [Line Items]
Option to extend lease, term	1 year
Operating leases, term of contract	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Option to extend lease, term	6 years
Operating leases, term of contract	5 years
ASU 2016-02
Lessee Lease Description [Line Items]
Operating Lease, Liability		2,800,000
Right of use assets		$ 2,600,000
Office Space [Member]
Lessee Lease Description [Line Items]
Option to extend lease, term		5 years	5 years