Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Goodwill (Details)

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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Impairment $ 3,203,000 $ 0 $ 0