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Net Loss Per Share (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Stock options and warrants excluded from calculation of diluted net loss per share (shares) 17,320,280us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 26,968,158us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount