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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Other Financial Information [Abstract] |  |
Diagnostic testing supplies | $ 1,077 | $ 1,091
Prepaid product royalties | 44 | 49
Prepaid maintenance and insurance contracts | 1,511 | 2,008
Other prepaid expenses and other current assets | 430 | 490
Prepaid expenses and other current assets | $ 3,062 | $ 3,638

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