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Details of Certain Financial Statement Components - Changes in the carrying amount of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes in the carrying amount of goodwill
Balance at the beginning of the year	$ 2,461	$ 650
Adjustment to goodwill, acquisition price allocation of SPEC/KWJ		(404)
Adjustment to goodwill, foreign currency exchange rate changes	(35)	151
Balance at the end of the year	2,658	2,461
Calman
Changes in the carrying amount of goodwill
Goodwill acquired in acquisition		$ 2,064
Conductive Transfers
Changes in the carrying amount of goodwill
Goodwill acquired in acquisition	$ 232

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