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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Financial Information [Abstract]
Diagnostic testing supplies	$ 1,010	$ 1,203
Prepaid product royalties	54	68
Prepaid maintenance and insurance contracts	1,040	2,229
Other prepaid and other current assets	301	659
Prepaid and other current assets	$ 2,405	$ 4,159

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