Fixed Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Furniture and fixtures	$ 47	$ 47
Laboratory equipment	508	508
Computer and communications equipment	261	261
Design and tooling	1,204	1,204
Machinery and equipment		167
Property, Plant and Equipment, Gross, Total	2,020	2,187
Less accumulated depreciation and amortization	(1,842)	(1,825)
Total	$ 178	$ 362	[1]

[1] Derived from audited information