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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Financial Information [Abstract]
Diagnostic testing supplies	$ 947	$ 1,427
Prepaid product royalties	75	123
Prepaid maintenance and insurance contracts	1,277	1,768
Other prepaid assets	201	133
Prepaid and other current assets	$ 2,500	$ 3,451

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