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Other Financial Information - Accrued and other current liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Financial Information [Abstract]
Accrued payroll and related expenses	$ 3,362	$ 4,048
Accrued interest	140	139
Accrued purchases of goods and services	1,482	510
Accrued royalties	151	180
Accrued clinical study activity	234	254
Finance lease liabilities - current	592	587
Other accrued liabilities	760	1,108
Accrued and other current liabilities	$ 6,721	$ 6,826

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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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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. 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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