Annual report pursuant to Section 13 and 15(d)

Statements of Stockholders' Equity (Parenthetical)

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Statements of Stockholders' Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statements of Stockholders' Equity [Abstract]      
Common stock issued for cash, issuance costs $ 1,380,413 $ 1,753,190 $ 181,035