Liquidation Basis of Accounting - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Statutory Accounting Practices [Line Items]
Increase in net assets	$ 580	$ 2,790
(Increase) decrease in estimated costs during the Dissolution period	210	(458)
Increase (decrease) in estimated net realizable value	90	2,990
Decrease in other liabilities	281	263
Liquidating distribution	0	6,932
Asset Sale Agreement
Statutory Accounting Practices [Line Items]
Increase (decrease) in estimated net realizable value		1,110
Professional fees
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the Dissolution period	150	(350)
Compensation
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the Dissolution period	(20)	(280)
Insurance
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the Dissolution period		(130)
Other expenses associated with wind-down activities
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the Dissolution period	80	300
Other assets
Statutory Accounting Practices [Line Items]
Increase (decrease) in estimated net realizable value		27
Land
Statutory Accounting Practices [Line Items]
Increase (decrease) in estimated net realizable value		(448)
IQstream Patents
Statutory Accounting Practices [Line Items]
Net assets in liquidation	0
Increase (decrease) in estimated net realizable value		300
IBM Patents
Statutory Accounting Practices [Line Items]
Increase (decrease) in estimated net realizable value		2,000
Liquidation Basis of Accounting
Statutory Accounting Practices [Line Items]
Net assets in liquidation	10,080	9,496	$ 13,637
Cash and cash equivalents	10,943	12,241
Land	2,500	2,500
Other assets	47	47
Accrued expenses	47	44
Reserve for estimated costs during the Dissolution period	1,776	3,462
Other liabilities	1,587	1,786
Increase (decrease) of net assets	580	(4,140)
(Increase) decrease in estimated costs during the Dissolution period	210	(458)
Decrease in other liabilities	$ 281	263
Liquidating distribution		6,932
Liquidation Basis of Accounting | Professional fees
Statutory Accounting Practices [Line Items]
Reserve for estimated costs during the Dissolution period	$ 568	1,154
Liquidation Basis of Accounting | Compensation
Statutory Accounting Practices [Line Items]
Reserve for estimated costs during the Dissolution period	376	1,004
Liquidation Basis of Accounting | Insurance
Statutory Accounting Practices [Line Items]
Reserve for estimated costs during the Dissolution period	186	294
Liquidation Basis of Accounting | Other expenses associated with wind-down activities
Statutory Accounting Practices [Line Items]
Reserve for estimated costs during the Dissolution period	$ 646	1,010
Liquidation Basis of Accounting | Land
Statutory Accounting Practices [Line Items]
Increase (decrease) in estimated net realizable value		$ (448)