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Goodwill and Intangible Assets, Net - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill accumulated impairment losses $ (13,823)   $ (13,823)
Amortization expense $ 4,926 $ 4,618