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Property and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Property and equipment, net
Leasehold improvements	$ 542		$ 542		$ 542
Equipment under operating lease	1,640		1,640		2,273
Total	2,182		2,182		2,815
Accumulated depreciation	(1,904)		(1,904)		(2,390)
Property and equipment, net	278		278		425
Depreciation of property and equipment	102	$ 184	218	$ 383	$ 707
Equipment under operating lease	$ 135	$ 0	$ 213	$ 0

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Amount of divestiture of long-lived, physical assets subject to or available for operating lease .

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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