Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Details) - USD ($) $ in Thousands		Jul. 31, 2019	Oct. 31, 2018
Receivables [Abstract]
Contract receivable		$ 2,016	$ 7,415
Unbilled contracts receivables	[1]	6,217	10,632
Commercial customers accounts receivable		8,233	18,047
Advanced Technologies including U.S. government, Amount billed receivable		1,689	1,865
Advanced Technologies including U.S. government, Unbilled receivables		1,969	3,127
Advanced Technologies including U.S. government, Accounts receivable	[2]	3,658	4,992
Accounts receivable, net and unbilled receivables		$ 11,891	$ 23,039

[1] Additional long-term unbilled receivables of $4.2 million and $9.4 million are included within “Other Assets” as of July 31, 2019 and October 31, 2018, respectively. The balance decreased because amounts previously recorded in connection with the Bridgeport Fuel Cell Project service agreement were settled in connection with the acquisition of the Bridgeport Fuel Cell Project.

[2] Total U.S. government accounts receivable, including unbilled receivables, outstanding as of July 31, 2019 and October 31, 2018 were $1.0 million and $2.3 million, respectively.