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Financial Statement Details - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Royalties | $ 1,727 | $ 1,558
Payroll and related expenses | 2,415 | 2,870
Professional fees | 514 | 1,789
Accrued interest | 239 | 239
Deferred revenue | 2,048 | 1,823
Acquisition-related liabilities | 1,000 | 13,186
Other | 5,081 | 6,093
Accrued expenses and other current liabilities, total | $ 13,024 | $ 27,558

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