Property and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 57,809	$ 56,931
Less accumulated depreciation and amortization	(49,306)	(47,629)
Property and equipment, net	8,503	9,302
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	37,280	35,642
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,726	1,726
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,624	18,505
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 179	$ 1,058

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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