Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 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	0	167
Property, Plant and Equipment, Gross, Total	2,020	2,187
Less accumulated depreciation and amortization	(1,941)	(1,825)
Total	$ 79	$ 362

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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