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REVENUE AND SEGMENT INFORMATION - Revenue by customer type and geographic area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue:
Revenue	$ 9,617	$ 8,842	$ 18,344	$ 17,831
United States | Total product sales
Revenue:
Revenue	61	38	124	78
Germany | Total product sales
Revenue:
Revenue	3,355	2,779	6,151	6,316
All other countries | Total product sales
Revenue:
Revenue	6,201	6,025	12,069	11,437
Direct
Revenue:
Revenue	5,624	4,473	10,373	9,782
Direct | United States | Total product sales
Revenue:
Revenue	61	20	124	42
Direct | Germany | Total product sales
Revenue:
Revenue	3,355	2,779	6,151	6,316
Direct | All other countries | Total product sales
Revenue:
Revenue	2,208	1,674	4,098	3,424
Distributors/Strategic Partners
Revenue:
Revenue	3,993	4,369	7,971	8,049
Distributors/Strategic Partners | United States | Total product sales
Revenue:
Revenue		18		36
Distributors/Strategic Partners | All other countries | Total product sales
Revenue:
Revenue	$ 3,993	$ 4,351	$ 7,971	$ 8,013

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