Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of property and equipment
Computer equipment and purchased software	$ 3,779	$ 3,748
Machinery and equipment	654	654
Furniture and fixtures	575	546
Leasehold improvements	899	884
Total	5,907	5,832
Less accumulated depreciation	(4,714)	(4,551)
Property and equipment, net	$ 1,193	$ 1,281

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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