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Intangible Asset - Schedule of Carrying Value of Intangible Asset (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Goodwill And Intangible Assets Disclosure [Abstract] |  |
Technology rights | $ 11,624 | $ 11,624
Accumulated amortization | (4,467) | (4,144)
Intangible assets, net | $ 7,157 | $ 7,480

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