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Goodwill and Acquired Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 2,349  
2018 2,128  
2019 2,066  
2020 512  
Net $ 7,055 $ 7,950