Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Details) - USD ($) $ in Thousands		Apr. 30, 2021	Oct. 31, 2020
Receivables [Abstract]
Amount billed		$ 10,183	$ 7,329
Unbilled receivables	[1]	6,289	7,063
Commercial customers accounts receivable		16,472	14,392
Advanced Technologies including U.S. government, Amount billed	[2]	1,964	2,234
Advanced Technologies including U.S. government, Unbilled receivables	[2]	1,371	978
Advanced Technologies including U.S. government, Accounts receivable	[2]	3,335	3,212
Accounts receivable, net and unbilled receivables		$ 19,807	$ 17,604

[1] Additional long-term unbilled receivables of $9.9 million and $8.9 million are included within “Other Assets” as of April 30, 2021 and October 31, 2020, respectively.

[2] Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2021 and October 31, 2020 were $1.0 million and $1.1 million, respectively.