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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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6 Months Ended | ||||
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Jun. 30, 2014
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Dec. 31, 2013
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Jun. 30, 2014
Stock Option [Member]
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Jun. 30, 2014
Argus Neurooptics LLC [Member]
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Mar. 17, 2014
Argus Neurooptics LLC [Member]
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| Accounting Policies [Line Items] | |||||
| Gain (Loss) on Sale of Assets and Asset Impairment Charges | $ 400,000 | ||||
| Long-term Investments, Total | 250,000 | 0 | 250,000 | 250,000 | |
| Short-term Investments | $ 295,000 | $ 0 | $ 243,000 | ||
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. No definition available.
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| X | ||||||||||
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- Definition
The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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