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BALANCE SHEET COMPONENTS - Schedule of inventory, net (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 649		$ 719
Work in progress	1		1
Finished goods	61		74
Total inventory	711		794
Less: reserve for obsolescence	0	$ 0	0	$ 0	$ (5)	$ (5)
Inventory, net	$ 711		$ 794