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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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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