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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Financial Information [Abstract]
Diagnostic testing supplies	$ 998	$ 1,091
Prepaid product royalties	46	49
Prepaid maintenance and insurance contracts	1,865	2,008
Other prepaid expenses and other current assets	65	490
Prepaid expenses and other current assets	$ 2,974	$ 3,638

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