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Other Financial Information - Prepaid expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
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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Other Financial Information

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