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BALANCE SHEET COMPONENTS - Schedule of inventory, net (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 643		$ 719
Work in progress	5		1
Finished goods	119		74
Total inventory	767		794
Less: reserve for obsolescence	0	$ 0	0	$ 0	$ 0	$ (5)
Inventory, net	$ 767		$ 794