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Nature of the Business and Operations and Liquidity - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 69 Months Ended
May 10, 2017
USD ($)
May 26, 2017
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
employee
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Description Of Business [Line Items]                    
Accumulated deficit       $ 982,339   $ 982,339   $ 982,339 $ 955,557  
Cash and cash equivalents       22,113 $ 25,063 22,113 $ 25,063 $ 22,113 $ 26,784 $ 39,330
Net cash used in operating activities           20,234 10,535      
Restructuring charges       $ 1 $ 0 $ 1,328 $ 0      
Number of workforce persons | employee       275   275   275    
Cash flows from financing activities               $ 85,100    
Proceeds from additional equity offering $ 17,000 $ 17,000                
Inox Wind Limited                    
Description Of Business [Line Items]                    
Strategic agreements value     $ 210,000              
Manufacturing agreement period, additional period required     3 years