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Financial Statement Details - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Royalties	$ 1,456	$ 1,558
Payroll and related expenses	2,469	2,870
Professional fees	1,369	1,789
Accrued interest	239	239
Deferred revenue	2,298	1,823
Restructuring	965	964
Acquisition-related liabilities	21,099	13,186
Other	5,502	5,129
Total accrued expenses and other current liabilities	$ 35,397	$ 27,558

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