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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Other Financial Information [Abstract] |  |
Other current assets | $ 1,299 | $ 1,427
Prepaid product royalties | 110 | 123
Prepaid maintenance and insurance contracts | 1,651 | 1,768
Other prepaid assets | 24 | 133
Prepaid and other current assets | $ 3,084 | $ 3,451

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