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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Other Financial Information [Abstract] |  |
Other current assets | $ 916 | $ 1,174
Prepaid product royalties | 137 | 176
Prepaid maintenance and insurance contracts | 619 | 698
Other prepaid assets | 14 | 148
Prepaid and other current assets | $ 1,686 | $ 2,196

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