The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

+ References+ Details

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References+ Details

- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments accounted for under the equity method of accounting as of the balance sheet date.

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- Definition

This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities within one year of the balance sheet date or the normal operating cycle, whichever is longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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-Number 115

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details

- Definition

This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References+ Details

Fair Value Measurements - Additional Information (Detail) (USD $)			3 Months Ended		1 Months Ended	3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 PixelOptics, Inc.	Jun. 30, 2013 PixelOptics, Inc. Level 3	Feb. 28, 2013 NuPathe	Jun. 30, 2013 Penn Mezzanine
Schedule Of Available For Sale Securities [Line Items]
Marketable securities, current	$ 70,231,000	$ 110,957,000
Marketable securities, non current	7,146,000	29,059,000
Number of convertible preferred stock units					2,500
Number of common shares after conversion					2,500,000
Impairment charges			9,900,000			300,000
Ownership interest				$ 3,300,000