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Goodwill & Intangibles - Summary of Goodwill and Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Intangibles $ 268 $ 268
Less: accumulated amortization (115) (98)
Intangible assets, net $ 153 $ 170