Marketable Securities Marketable Securities

12 Months Ended

Oct. 31, 2017

Marketable Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

Marketable Securities

On March 11, 2014, we entered into a manufacturing agreement with Velocys, plc ("Velocys"). As part of the agreement, we invested $2,000, which is comprised of Velocys stock with a market value of $1,527 on the date of acquisition and a premium paid of $473, which is being amortized. The agreement was terminated on March 30, 2017. In May 2017, we considered the decline in market value of our investment in Velocys to be other than temporary and recognized an other than temporary impairment loss of $695, which was recorded within other expense in our consolidated statement of operations.