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Intangible Asset - Schedule of Carrying Value of Intangible Asset (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Technology rights $ 20,081 $ 20,081
Accumulated amortization (5,904) (4,823)
Intangible asset, net $ 14,177 $ 15,258