Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012		Oct. 31, 2011		Oct. 31, 2010
schedule of revenues by geographic area [Line Items]
Revenues	$ 35,420	$ 29,693	$ 24,153	$ 31,337	$ 34,723	$ 31,160	$ 28,607	$ 28,080	$ 120,603	[1]	$ 122,570	[1]	$ 69,777	[1]
UNITED STATES
schedule of revenues by geographic area [Line Items]
Revenues									26,929		66,531		28,764
south korea [Domain]
schedule of revenues by geographic area [Line Items]
Revenues									92,163		53,256		40,148
UNITED KINGDOM
schedule of revenues by geographic area [Line Items]
Revenues									1,061		1,639		0
INDONESIA
schedule of revenues by geographic area [Line Items]
Revenues									147		675		0
GERMANY
schedule of revenues by geographic area [Line Items]
Revenues									128		290		681
CANADA
schedule of revenues by geographic area [Line Items]
Revenues									175		156		136
JAPAN
schedule of revenues by geographic area [Line Items]
Revenues									$ 0		$ 23		$ 48

[1] (1) Includes revenue from a related party. Refer to Concentrations in note 1 to the financial statements.