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Summary of Significant Accounting Policies - Advertising Costs (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Accounting Policies [Abstract]        
Advertising expense $ 237,000 $ 92,000 $ 331,000 $ 220,000