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Summary of Significant Accounting Policies - Minimum Future Licensing Revenue (Detail) (Fiber Optic Licensing and Other [Member], Scenario, Forecast [Member], Minimum [Member], USD $) | 3 Months Ended | 12 Months Ended | 84 Months Ended | 135 Months Ended
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Dec. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2025 | Dec. 31, 2025
Fiber Optic Licensing and Other [Member] | Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |
License And Collaboration Agreements [Line Items] |  |  |  |  |  |  |
Fixed non-cancelable minimum licensing revenues | $ 23,571 | $ 41,028 | $ 52,425 | $ 64,793 | $ 77,631 | $ 145,452 | $ 404,900

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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