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Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended
Stock-Based Compensation (Details Textual) (USD $)	Mar. 31, 2012	Mar. 31, 2011
Stock options [Member]
Stock Based Compensation (Textual) [Abstract]
Granted stock options	2,733,390	2,128,055
Weighted-average grant-date fair value	$ 3.76	$ 5.74
Common Shares [Member]
Stock Based Compensation (Textual) [Abstract]
Stock issuances under equity compensation plans	105,348	505,700

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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