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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 |  |  |  |

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