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Nature of the Business and Operations and Liquidity - Additional Information (Detail)
 3 Months Ended 9 Months Ended 45 Months Ended
Oct. 06, 2015
USD ($)
Apr. 29, 2015
USD ($)
Mar. 24, 2015
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Employee
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Employee
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Description Of Business [Line Items]                  
Reverse stock split     0.1            
Accumulated deficit         $ (924,822,000)   $ (924,822,000) $ (905,045,000)  
Cash and cash equivalents         36,437,000 $ 35,983,000 $ 36,437,000 $ 20,490,000 $ 43,114,000
Net cash used in operating activities         $ 7,799,000 20,934,000      
Number of workforce persons | Employee         339   339    
Cash flows from financing activities         $ 19,202,000 9,747,000 $ 72,000,000    
Proceeds from additional equity offering   $ 22,300,000              
Net proceeds from sale of ownership interest         2,155,000 (644,000)      
Impairment of minority interest investment         746,000 3,464,000      
Tres Amigas                  
Description Of Business [Line Items]                  
Net proceeds from sale of ownership interest         (356,000)        
Impairment of minority interest investment       $ 746,000 $ 746,000        
Blade Dynamics Ltd                  
Description Of Business [Line Items]                  
Percentage of outstanding common stock 100.00%                
Net proceeds from sale of ownership interest $ 2,500,000                
Impairment of minority interest investment           $ 3,500,000      
Milestone achievement period 3 years                
Blade Dynamics Ltd | Maximum                  
Description Of Business [Line Items]                  
Additional proceeds receivable upon successful achievement of certain milestones $ 1,600,000