Quarterly report pursuant to Section 13 or 15(d)

Investments in unconsolidated entities - Additional Information (Detail)

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Investments in unconsolidated entities - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Investments in and Advances to Affiliates [Line Items]        
Other than temporarily impaired and written off investment $ 3,254,000 $ 0 $ 3,254,000 $ 0
Nephromics, Inc.
       
Investments in and Advances to Affiliates [Line Items]        
Percentage of investment in equity interest 16.80%   16.80%  
Other than temporarily impaired and written off investment 2,400,000      
Net investment under equity method 925,000   925,000  
ACTGen, Inc.
       
Investments in and Advances to Affiliates [Line Items]        
Other than temporarily impaired and written off investment $ 854,000      
Ownership percentage on a cost basis 13.60%   13.60%