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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]          
Amortization of Intangible Assets $ 267 $ 63 $ 534 $ 121  
Goodwill $ 56,055   56,055   $ 56,429
Goodwill, Foreign Currency Translation Gain (Loss)     $ (374)