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Financial Statement Details - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
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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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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