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Accounts receivable, net (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Accounts receivable, net (Narrative) (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accounts receivable, net [Abstract]
Allowance for doubtful accounts	$ 874,307	$ 89,572	$ 1,156,434	$ 146,393
Accounts receivable written off			$ 102,353	$ 60,426

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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