Discontinued Operations - Reconciliation of Carrying Amounts of Major Classes of Current Liabilities of Fiber Optic Licensing Operations (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current liabilities:
Accounts payable and accrued expenses	$ 2,651	$ 15,313
Total current liabilities of discontinued operations	$ 2,651	$ 15,313