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Nature of the Business and Operations and Liquidity - Additional Information (Detail)
 3 Months Ended 6 Months Ended 42 Months Ended
Oct. 06, 2015
USD ($)
Apr. 29, 2015
USD ($)
Mar. 24, 2015
Nov. 13, 2014
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Employee
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Employee
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Description Of Business [Line Items]                    
Reverse stock split     0.1              
Accumulated deficit           $ (921,864,000)   $ (921,864,000) $ (905,045,000)  
Cash and cash equivalents           32,572,000 $ 34,679,000 $ 32,572,000 $ 20,490,000 $ 43,114,000
Net cash used in operating activities           $ 7,767,000 11,369,000      
Number of workforce persons | Employee           303   303    
Cash flows from financing activities           $ 20,202,000 844,000 $ 74,000,000    
Proceeds from additional equity offering   $ 22,300,000   $ 9,100,000            
Net proceeds from sale of ownership interest           (356,000) (410,000)      
Tres Amigas                    
Description Of Business [Line Items]                    
Net proceeds from sale of ownership interest           (356,000)        
Impairment charge on investment         $ 700,000 $ 746,000        
Blade Dynamics Ltd                    
Description Of Business [Line Items]                    
Impairment charge on investment             $ 3,500,000      
Blade Dynamics Ltd | Subsequent Event                    
Description Of Business [Line Items]                    
Percentage of outstanding common stock 100.00%                  
Net proceeds from sale of ownership interest $ 2,500,000                  
Milestone achievement period 3 years                  
Blade Dynamics Ltd | Maximum | Subsequent Event                    
Description Of Business [Line Items]                    
Additional proceeds receivable upon successful achievement of certain milestones $ 1,600,000