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Impairment Losses on Investments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Nephromics	Jun. 30, 2012 Nephromics	Mar. 31, 2013 ACTGen, Inc.
Other Than Temporary Impairment Losses Recognized [Line Items]
Percentage of investment in equity interest					16.80%
Other than temporarily impaired and written off investment	$ 0	$ 3,254,000	$ 0	$ 3,254,000	$ 2,400,000		$ 854,000
Net investment under equity method					$ 505,000	$ 505,000

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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