Segment Information - Revenues by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
schedule of revenues by geographic area [Line Items]
Revenues	$ 47,889	$ 10,358	$ 20,417	$ 17,002	$ 24,473	$ 21,716	$ 28,581	$ 33,482	$ 95,666	$ 108,252	$ 163,077
UNITED STATES
schedule of revenues by geographic area [Line Items]
Revenues									47,539	48,697	52,109
SOUTH KOREA
schedule of revenues by geographic area [Line Items]
Revenues									44,217	52,007	109,953
ENGLAND
schedule of revenues by geographic area [Line Items]
Revenues									368	277	142
GERMANY
schedule of revenues by geographic area [Line Items]
Revenues									2,740	7,147	764
CANADA
schedule of revenues by geographic area [Line Items]
Revenues									729	$ 124
SPAIN
schedule of revenues by geographic area [Line Items]
Revenues									$ 73		$ 109