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Financial Statement Details - Summary of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Royalties $ 1,564 $ 1,558
Payroll and related expenses 2,499 2,870
Professional fees 727 1,789
Accrued interest 1,685 239
Deferred revenue 2,464 1,823
Acquisition-related liabilities 1,000 13,186
Other 6,468 6,093
Total accrued expenses and other current liabilities $ 16,407 $ 27,558