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Equity Incentive Plan (Stock Options Outstanding) (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Equity Incentive Plans [Abstract]    
Number of Stock Options Outstanding, Beginning Balance 2,805,912  
Number of Stock Options Granted 20,900  
Number of Stock Options Exercised (30,033)  
Number of Stock Options Outstanding, Ending Balance 2,796,779 2,805,912
Number of Stock Options Exercisable 2,279,981  
Weighted Average Grant Date Fair Value Outstanding, Beginning Balance $ 2.30  
Weighted Average Grant Date Fair Value, Granted $ 3.06  
Weighted Average Grant Date Fair Value, Exercised $ 2.30  
Weighted Average Grant Date Fair Value, Outstanding, Ending Balance $ 2.30 $ 2.30
Weighted Average Grant Date Fair Value, Exercisable $ 2.30  
Weighted Average Exercise Price Outstanding, Beginning Balance $ 7.09  
Weighted Average Exercise Price, Granted $ 11.97  
Weighted Average Exercise Price, Exercised $ 7.09  
Weighted Average Exercise Price Outstanding, Ending Balance $ 7.09 $ 7.09
Weighted Average Exercise Price, Exercisable $ 7.13  
Weighted Average Contractual Life, Outstanding 5 years 4 months 2 days 6 years 26 days
Weighted Average Contractual Life, Granted 9 years 9 months 29 days  
Weighted Average Contractual Life, Exercisable 5 years 4 months 24 days