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Stock based Compensation (Details Textuals) (USD $)
9 Months Ended
Sep. 30, 2013
Stock Based Compensation [Line Items]  
Shares authorized for Issuance Under Employee Stock Purchase Plan 2,000,000
Employee Stock Purchase Plans Base Salary Investment Percentage Minimum 1.00%
Employee Stock Purchase Plans Base Salary Investment Percentage Maximum 15.00%
Employee Stock Purchase Plans Investment Limit Per Period Shares 1,500
Employee Stock Purchase Plans Investment Limit Per Calendar Year Fair Value $ 25,000
Employee Stock Purchase Plans Recognized Expense Related To Discount Rate 15.00%
MinimumMember
 
Stock Based Compensation [Line Items]  
Percentage Of Restricted Stock Shares Vesting Range 0.00%
MaximumMember
 
Stock Based Compensation [Line Items]  
Percentage Of Restricted Stock Shares Vesting Range 200.00%