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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Financial Information [Abstract]
Diagnostic testing supplies	$ 1,203	$ 1,427
Prepaid product royalties	68	123
Prepaid maintenance and insurance contracts	2,229	1,768
Other prepaid and other current assets	659	133
Prepaid and other current assets	$ 4,159	$ 3,451

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