PROPERTY, PLANT AND EQUIPMENT (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total	$ 2,512	$ 2,512
Less: accumulated depreciation	(1,853)	(1,833)
Net property, plant and equipment	659	679
Building and improvements
Property, Plant and Equipment [Line Items]
Total	1,273	1,273
Scientific equipment
Property, Plant and Equipment [Line Items]
Total	598	598
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total	107	107
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	275	275
Land and improvements
Property, Plant and Equipment [Line Items]
Total	162	162
Other personal property
Property, Plant and Equipment [Line Items]
Total	70	70
Office equipment
Property, Plant and Equipment [Line Items]
Total	$ 27	$ 27