PROPERTY AND EQUIPMENT - Property and equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 68,165	$ 66,299
Less: Accumulated depreciation and amortization	48,716	47,767
Property plant and equipment, net	19,449	18,532
Diagnostic Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	36,999	35,277
Research, development and demonstration equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	6,499	6,491
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	2,128	2,128
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	3,760	3,756
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	17,839	17,707
Building [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 940	$ 940