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Financial Statement Details - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Royalties	$ 2,410	$ 1,415
Payroll and related expenses	6,006	2,716
Professional fees	921	483
Accrued interest	888	1,543
Deferred revenue	2,853	2,235
Operating lease liabilities	1,619	1,101
Acquisition-related liabilities	0	1,000
Other	8,676	7,555
Accrued expenses and other current liabilities, total	$ 23,373	$ 18,048

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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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