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Other Financial Information - Accrued and other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Financial Information [Abstract]
Accrued payroll and related expenses	$ 2,534	$ 2,362
Accrued interest	141	145
Accrued purchases of goods and services	318	319
Accrued royalties	193	727
Accrued clinical study activity	93	40
Capital lease obligations, current portion	242	238
Other accrued liabilities	796	588
Accrued and other current liabilities	$ 4,317	$ 4,419

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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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Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. 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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