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Other Financial Information - Prepaid expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Financial Information [Abstract]    
Diagnostic testing supplies $ 841 $ 1,427
Prepaid product royalties 72 123
Prepaid maintenance and insurance contracts 897 1,768
Other prepaid and other current assets 14 133
Prepaid and other current assets $ 1,824 $ 3,451