Description of Business - Additional Information (Detail) $ / shares in Units, $ in Thousands							1 Months Ended
	Apr. 29, 2016 USD ($) $ / shares	Feb. 25, 2016 USD ($)	Feb. 12, 2016	May. 22, 2014 USD ($) Patent	Feb. 28, 2014 USD ($) Patent	Jan. 31, 2013 USD ($)	Jul. 31, 2000 USD ($)	Apr. 30, 2016 a Employee	Oct. 10, 2014 USD ($)	Mar. 07, 2013 $ / shares
Entity Information [Line Items]
Sale of shared facilities and assets, value						$ 18,750
Common stock, par value | $ / shares										$ 0.001
Number of employees | Employee								1
Additional wind down period		2 years
Remaining non-cash assets to be retained for anticipated wind down costs and expenses		$ 3,540
Liquidating cash distribution, per share | $ / shares	$ 0.29
Liquidating distribution	$ 8,376
Tejas
Entity Information [Line Items]
Payment to acquire business							$ 2,200
Business acquisition, approximate ownership percentage acquired							5.00%
Additional wind down period			2 years
Tyngsborough Massachusetts
Entity Information [Line Items]
Sale of facilities and assets, value									$ 2,500
Tyngsborough Massachusetts | Termination of Restated Purchase and Sale Agreement with Tyngsborough Commons, LLC
Entity Information [Line Items]
Ownership of land | a								102
IBM Patents
Entity Information [Line Items]
Patent sale agreement, number of patents | Patent					40
Patent sale agreement, number of patent applications | Patent					2
Amount received from sale of patents					$ 2,000
IQstream Patents
Entity Information [Line Items]
Patent sale agreement, number of patents | Patent				3
Patent sale agreement, number of patent applications | Patent				6
Amount received from sale of patents				$ 300