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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]          
Amortization of Intangible Assets $ 266 $ 159 $ 800 $ 280  
Goodwill $ 56,106   56,106   $ 56,429
Goodwill, Foreign Currency Translation Gain (Loss)     $ (323)