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Financial Statement Details - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Royalties | $ 1,835 | $ 1,727
Payroll and related expenses | 2,248 | 2,415
Professional fees | 522 | 514
Accrued interest | 239 | 239
Deferred revenue | 2,318 | 2,048
Operating lease liabilities | 1,507 |
Acquisition-related liabilities | 1,000 | 1,000
Other | 4,419 | 5,081
Total accrued expenses and other current liabilities | $ 14,088 | $ 13,024

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