BALANCE SHEET COMPONENTS - Schedule of prepaid expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Software licenses	$ 69	$ 112
Professional services	51	18
Inventory	18	0
Insurance	39	27
Equity offering costs	24	146
Rent	12	38
Marketing programs and conferences	4	21
Other	21	15
Total prepaid expenses and other current assets	$ 238	$ 377