Accounts Receivable - Schedule of Accounts Receivable (Details) (Parenthetical) - USD ($) $ in Thousands		Apr. 30, 2017	Oct. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
U.S. government accounts receivable total	[1]	$ 9,956	$ 5,531
Long-term investments and receivables, net		14,200	5,700
Government [Member]
Accounts Notes And Loans Receivable [Line Items]
U.S. government accounts receivable total		$ 3,500	$ 2,200

[1] Total U.S. Government accounts receivable outstanding as of April 30, 2017 and October 31, 2016 were $3.5 million and $2.2 million, respectively.