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Total Assets by Geographic Area (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]
Asset	$ 97,010,163	$ 76,056,814
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Asset	58,356,697	44,223,080
Sweden
Segment Reporting, Asset Reconciling Item [Line Items]
Asset	$ 38,653,466	$ 31,833,734

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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