BALANCE SHEET COMPONENTS - Schedule of prepaid expenses (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Equity offering costs	$ 124,000	$ 0
Software licenses	116,000	152,000
Professional services	48,000	30,000
Insurance	47,000	64,000
Prepaid inventory	29,000	111,000
Other	100,000	31,000
Total prepaid expenses and other current assets	$ 464,000	$ 388,000