Property and Equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property and equipment-at cost:
Total property and equipment-at cost	$ 13,553	$ 12,874
Less accumulated depreciation	(6,206)	(5,800)
Property and equipment, net	7,347	7,074
Plant and machinery [Member]
Property and equipment-at cost:
Total property and equipment-at cost	3,223	3,059
Instruments [Member]
Property and equipment-at cost:
Total property and equipment-at cost	6,105	5,795
Office equipment [Member]
Property and equipment-at cost:
Total property and equipment-at cost	1,140	1,047
Leasehold improvements [Member]
Property and equipment-at cost:
Total property and equipment-at cost	$ 3,085	$ 2,973

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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