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Related Party Notes Payable (Narrative) (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Day
Sep. 30, 2011
Mar. 31, 2011
Sep. 24, 2008
Year
Jun. 27, 2008
Jun. 29, 2007
Mar. 31, 2004
Year
Oct. 31, 2003
Dec. 31, 2002
Year
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Related Party Transaction [Line Items]                          
Maturity period of related party notes 90     3     5   5        
Interest rate of related party notes 8.00%           12.00%   12.00%        
Loan balance           $ 2,000,000 $ 2,500,000 $ 2,000,000 $ 2,000,000 $ 5,000,000 $ 5,600,000 $ 5,000,000  
Maximum Number of warrants purchased against loan   238,393 1,218,493 1,525,515 73,889 333,333 312,500 128,766 236,742        
Exercise price of warrants       $ 0.95 $ 0.90 $ 1.20 $ 2.00 $ 3.88 $ 2.11        
Warrants Expiration Date           June 2010 March 2007 October 2008 December 2005     June 2008 June 2007
Related party notes payable Value           1,800,000 2,300,000 1,800,000 1,830,000   5,563,000    
Amortization of debt issuance costs       272,000   187,000,000 223,000 195,000 173,000       84,000
Total outstanding indebtedness       13,800,000                  
Converted portion of outstanding indebtedness into shares of common stock       6,500,000                  
Note conversion fair value       3,400,000                  
Remaining outstanding indebtedness       7,300,000                  
Gain on note conversion       3,100,000                  
Periodic payment of notes                   43,817   2,900,000  
Warrants exercised   307,022 1,218,493                    
Maturity date of related party notes Jun. 29, 2012                        
Notes payable,Face Amount 5,600,000                        
Interest expense on related party notes $ 109,000                   $ 588,000.0 $ 1,200,000 $ 1,000,000