BALANCE SHEET COMPONENTS - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,456	$ 2,962
Less accumulated depreciation and amortization	1,729	1,868
Property and equipment, net	727	1,094
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 101	108
Equipment
Property, Plant and Equipment [Line Items]
Lesser of lease term or lives	5 years
Property and equipment, gross	$ 1,040	1,252
Computer and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 570	857
Website and application development
Property, Plant and Equipment [Line Items]
Lesser of lease term or lives	3 years
Property and equipment, gross	$ 37	37
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	703	703
Work-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5	$ 5
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Lesser of lease term or lives	10 years
Minimum | Computer and software
Property, Plant and Equipment [Line Items]
Lesser of lease term or lives	3 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Lesser of lease term or lives	15 years
Maximum | Computer and software
Property, Plant and Equipment [Line Items]
Lesser of lease term or lives	5 years