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Other Financial Information - Prepaid Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Other Financial Information [Abstract] |  |
Diagnostic testing supplies | $ 1,091 | $ 1,203
Prepaid product royalties | 49 | 68
Prepaid maintenance and insurance contracts | 2,008 | 2,229
Other prepaid and other current assets | 490 | 659
Prepaid and other current assets | $ 3,638 | $ 4,159

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