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Other Financial Information - Prepaid Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Financial Information [Abstract]
Diagnostic testing supplies	$ 1,091	$ 1,203
Prepaid product royalties	49	68
Prepaid maintenance and insurance contracts	2,008	2,229
Other prepaid and other current assets	490	659
Prepaid and other current assets	$ 3,638	$ 4,159

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