Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Fair Value, Goodwill (Details)

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Fair Value Measurement - Fair Value, Goodwill (Details) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Goodwill impairment $ 0 $ 1,016,325