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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
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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Other Financial Information

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Amount of current assets classified as other.

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