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BALANCE SHEET COMPONENTS - Schedule of inventory, net (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 780		$ 747
Work in progress	7		0
Finished goods	112		53
Total inventory	899		800
Less: reserve for obsolescence	0	$ (5)	(5)	$ (18)	$ (18)	$ (18)
Inventory, net	$ 899		$ 795