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Intangible Asset (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Goodwill And Intangible Assets Disclosure [Abstract] |  |
Technology rights | $ 11,624 | $ 11,624
Accumulated amortization | (3,821) | (3,498)
Intangible asset, net | $ 7,803 | $ 8,126

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