Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross		$ 6,918
Total property, plant, equipment, and ROU assets	$ 7,688
Less accumulated depreciation		(3,846)
Less accumulated depreciation	(5,613)
Total property, plant & equipment, net	2,075	3,072		$ 4,011
Total property, plant & equipment, net	2,075
Depreciation	300	1,000	$ 700
BUNAVAIL
Property, Plant and Equipment [Line Items]
Depreciation	1,500
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	5,635	5,635
Building
Property, Plant and Equipment [Line Items]
Right of use, building and lease	720
Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	437	406
Office Furniture and Equipment
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	174	155
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	43	43
Idle Equipment
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	$ 679	$ 679