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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 56,563,541us-gaap_CommonStockSharesIssued 53,832,782us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 56,563,541us-gaap_CommonStockSharesOutstanding 53,832,782us-gaap_CommonStockSharesOutstanding