Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross		$ 7,688
Total property, plant, equipment, and ROU assets	$ 6,441
Less accumulated depreciation		(5,613)
Less accumulated depreciation	(5,023)
Total property, plant & equipment, net		2,075	$ 3,072	$ 4,011
Total property, plant & equipment, net	1,418	2,075
Depreciation	500	1,800	$ 700
BUNAVAIL
Property, Plant and Equipment [Line Items]
Depreciation	1,500	1,500
Machinery & equipment
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	4,683	5,635
Building
Property, Plant and Equipment [Line Items]
Right of use, building and lease	471	720
Computer equipment & software
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	272	437
Office furniture & equipment
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	174	174
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
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	$ 119	$ 0