Annual report pursuant to section 13 and 15(d)

Statement of Shareholders' Equity [Parenthetical]

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Statement of Shareholders' Equity [Parenthetical] (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Offering costs and underwriter discounts on initial public offering (in dollars)   $ 4,073,359
Maximum conversion of shares   3,904,037
Shares subject to possible conversion 122,875 10,680
Shares due to expiration of underwriters' over allotment option   187,500