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Goodwill and Acquired Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 741  
2018 2,735  
2019 2,676  
2020 1,102  
2021 492  
Thereafter 902  
Net $ 8,648 $ 7,950