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Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 1.0 $ 0.4 $ 1.9 $ 1.0