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Intangible Assets, Net - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Finite Lived Intangible Assets Net [Abstract] |  |
Intangible assets | $ 19,773 | $ 19,773
Less accumulated amortization | (14,950) | (8,056)
Total | $ 4,823 | $ 11,717

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