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Basic and Diluted Net Loss Per Share (Details Textual)	3 Months Ended		6 Months Ended
Basic and Diluted Net Loss Per Share (Details Textual)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic and Diluted Net Loss Per Share (Textual) [Abstract]
Stock options outstanding excluded from calculation of diluted net loss per share	8,344,138	8,233,113	8,344,138	8,233,113

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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