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Financial Statement Details - Summary of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Finished goods | $ 14,797 | $ 14,331
Raw materials and components | 11,634 | 6,072
Total inventory | $ 26,431 | $ 20,403

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