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Net Loss Per Common Share (Details Textual)	6 Months Ended		12 Months Ended
Net Loss Per Common Share (Details Textual)	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Stock Option and Warrants [Member]
Net Loss Per Common Share (Textual)
Shares issuable excluded from computation of diluted net loss per share	7,139,165	8,991,955	6,867,705	10,461,455
Convertible Debt [Member]
Net Loss Per Common Share (Textual)
Shares issuable excluded from computation of diluted net loss per share				823,157

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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