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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Financial Information [Abstract]
Diagnostic testing supplies	$ 1,427	$ 1,174
Prepaid product royalties	123	176
Prepaid maintenance and insurance contracts	1,768	698
Other prepaid assets	133	148
Prepaid and other current assets	$ 3,451	$ 2,196

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