Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 821	$ 997
Accumulated depreciation and amortization	(755)	(754)
Construction in progress	12
Total property, plant and equipment	78	243
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	157	135
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	63	63
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	42	240
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 559	$ 559