Operating Lease Liabilities and Right-of-Use Assets - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) facility	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Non-cash lease expense	$ 214,000	$ 502,000
Sublease income	0	140,000
Operating lease, right-of-use asset, net	17,000	142,000	$ 659,000
Operating lease liabilities	17,000	236,000	$ 728,000
Impairment charges - right-of use assets	$ 0	$ 179,000
Los Angeles
Lessee, Lease, Description [Line Items]
Number of properties | facility	3
City of Industry
Lessee, Lease, Description [Line Items]
Number of facilities | facility	1