Discontinued Operations - Reconciliation of Carrying Amounts of Major Classes of Current Liabilities of Fiber Optic Licensing Operations (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current liabilities:
Accounts payable and accrued expenses	$ 3,088	$ 15,313
Total current liabilities of discontinued operations	$ 3,088	$ 15,313

Amount classified as accounts payable and accrued liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2473-110228

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1107-107759

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant