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Fixed Assets - Additional Information (Detail) (USD $)	3 Months Ended
Fixed Assets - Additional Information (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 29,000	$ 57,000

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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