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Intangible Assets, Net - Summary of Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite Lived Intangible Assets Net [Abstract] |  |
Intangible assets | $ 19,773 | $ 2,500
Less accumulated amortization | (8,056) | (1,194)
Total | $ 11,717 | $ 1,306

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