REVENUE - Revenue by customer type and geographic area (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Revenue:
Revenue, net	$ 37,063	$ 35,595
United States \| Total product sales
Revenue:
Revenue, net	249	151
Germany \| Total product sales
Revenue:
Revenue, net	11,751	13,050
All other countries \| Total product sales
Revenue:
Revenue, net	25,063	22,394
Direct
Revenue:
Revenue, net	20,603	20,781
Direct \| United States \| Total product sales
Revenue:
Revenue, net	249	115
Direct \| Germany \| Total product sales
Revenue:
Revenue, net	11,751	13,050
Direct \| All other countries \| Total product sales
Revenue:
Revenue, net	8,603	7,616
Distributors/Strategic Partners
Revenue:
Revenue, net	16,460	14,814
Distributors/Strategic Partners \| United States \| Total product sales
Revenue:
Revenue, net	0	36
Distributors/Strategic Partners \| Germany \| Total product sales
Revenue:
Revenue, net	0	0
Distributors/Strategic Partners \| All other countries \| Total product sales
Revenue:
Revenue, net	$ 16,460	$ 14,778

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details