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Commitments and contingencies (Details) (Office space and warehouse facilities, USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Office space and warehouse facilities
Operating Leased Assets [Line Items]
Rent expense, gross	$ 116,159	$ 41,132

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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