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Assets Held for Sale - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 24,000	$ 46,000
Gain loss on sale of assets held for sale	44,000	501,000
Net book value of assets held for sale sold during the period	46,000	416,000
Proceeds from sale of assets held for sale	$ 90,000	$ 917,000

The difference between the proceeds received and the carrying value of the long-lived asset. If the proceeds received exceeds the carrying value of the long-lived asset, then there is a gain. If the proceeds received is less than the carrying value of the long-lived asset, then there is a loss.

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