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Other Financial Information - Prepaid expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other Financial Information [Abstract]    
Diagnostic testing supplies $ 986 $ 1,203
Prepaid product royalties 61 68
Prepaid maintenance and insurance contracts 1,701 2,229
Other prepaid and other current assets 424 659
Prepaid and other current assets $ 3,172 $ 4,159