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Nature of the Business and Operations and Liquidity - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 48 Months Ended
Mar. 11, 2016
USD ($)
Oct. 06, 2015
USD ($)
Apr. 29, 2015
USD ($)
Mar. 24, 2015
Dec. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Employee
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Employee
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2016
USD ($)
Employee
Mar. 31, 2013
USD ($)
Description Of Business [Line Items]                        
Reverse stock split       0.1                
Accumulated deficit           $ (928,184,000)   $ (928,184,000) $ (905,045,000)   $ (928,184,000)  
Cash and cash equivalents           $ 39,330,000   39,330,000 20,490,000 $ 43,114,000 $ 39,330,000 $ 39,243,000
Net cash used in operating activities               $ 4,559,000 32,676,000 13,267,000    
Number of workforce persons | Employee           369   369     369  
Cash flows from financing activities               $ 18,202,000 8,783,000 12,796,000 $ 71,000,000  
Proceeds from additional equity offering     $ 22,300,000                  
Gain on minority interest investments               (356,000) $ (743,000) $ (1,008,000)    
Gain on sale of minority interests               3,092,000        
Proceeds from sale of minority interests               3,092,000        
Tres Amigas                        
Description Of Business [Line Items]                        
Percentage of minority share investment sold 100.00%                      
Minority share investment sold, amount $ 600,000                      
Gain on sale of minority interests           $ 300,000            
Tres Amigas | Scenario Forecast                        
Description Of Business [Line Items]                        
Proceeds from sale of minority interests             $ 300,000          
Blade Dynamics Ltd                        
Description Of Business [Line Items]                        
Percentage of outstanding common stock   100.00%                    
Gain on minority interest investments               2,800,000        
Milestone achievement period   3 years                    
Maximum | Blade Dynamics Ltd                        
Description Of Business [Line Items]                        
Additional proceeds receivable upon successful achievement of certain milestones   $ 1,200,000                    
Inox Wind Limited                        
Description Of Business [Line Items]                        
Strategic agreements value         $ 210,000,000              
Upfront payment received under license agreement           6,000,000            
Amount of advance payment not made under supply contract           $ 2,000,000   $ 2,000,000     $ 2,000,000  
Inox Wind Limited | Minimum                        
Description Of Business [Line Items]                        
Period allowable to manufacture the electrical control system               3 years        
Inox Wind Limited | Maximum                        
Description Of Business [Line Items]                        
Period allowable to manufacture the electrical control system               4 years