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Intangible Asset (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Technology rights $ 11,624 $ 11,624
Accumulated amortization (3,982) (3,498)
Intangible asset, net $ 7,642 $ 8,126