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Summary of Final Allocation of Fair Value of Assets Acquired (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Aug. 24, 2010
Business Acquisition [Line Items]
Commercialization rights-Asia			$ 2,017
Illuminators-inventory			270
Demonstration illuminators			135
Goodwill	1,316	1,316	1,316
Total			$ 3,738

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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