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Intangible Asset - Schedule of Carrying Value of Intangible Asset (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Technology rights | $ 32,081 | $ 20,081
Accumulated amortization | (7,898) | (6,264)
Intangible asset, net | $ 24,183 | $ 13,817

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