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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 30,548,309us-gaap_CommonStockSharesIssued 28,991,289us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 30,548,309us-gaap_CommonStockSharesOutstanding 28,991,289us-gaap_CommonStockSharesOutstanding