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Summary of Significant Accounting Policies (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stock options
Share-based compensation
Total Stock Compensation Expense	$ 1,322,000	$ 1,501,000
Restricted stock
Share-based compensation
Total Stock Compensation Expense	481,000	610,000
Employee Stock Purchase Plan
Share-based compensation
Total Stock Compensation Expense	$ (19,000)	$ 80,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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