BALANCE SHEET COMPONENTS - Schedule of prepaid expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Software licenses	$ 78	$ 112
Professional services	58	18
Inventory	58	0
Insurance	47	27
Equity offering costs	34	146
Rent	12	38
Marketing programs and conferences	8	21
Other	18	15
Total prepaid expenses and other current assets	$ 313	$ 377