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Nature of the Business and Operations and Liquidity - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Mar. 31, 2012
Jul. 24, 2013
Subsequent Event [Member]
Sep. 30, 2013
Subsequent Event [Member]
Jul. 31, 2013
Subsequent Event [Member]
Apr. 04, 2012
Senior Convertible Debt [Member]
Jun. 05, 2012
Senior Secured Term Loan [Member]
Description Of Business [Line Items]                  
Accumulated deficit $ (810,644,000)   $ (800,131,000)            
Cash and cash equivalents 32,608,000 60,487,000 39,243,000 46,279,000          
Net cash used in operating activities (9,307,000) (11,591,000)              
Debt, face amount   35,000,000           25,000,000 10,000,000
Reduction in global workforce, percentage     57.00%   7.00%        
Restructuring charge for severance and other costs           1,000,000      
Interest rate percentage               7.00%  
Amount of exchanged note converted             4,000,000    
Reduction of principle from conversion of shares $ 10,600,000