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Nature of the Business and Operations and Liquidity - Additional Information (Detail) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 63 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 26, 2017 USD ($) | May 10, 2017 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2017 USD ($) employee | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) employee | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | $ (970,809) |  | $ (970,809) | $ (955,557) |
Cash and cash equivalents |  |  |  | 37,477 | $ 35,211 | $ 37,477 | $ 26,784 | $ 39,330
Net cash used in operating activities |  |  |  | 5,430 | 2,060 |  |  |
Restructuring charges |  |  |  | $ 1,339 | 0 |  |  |
Number of workforce persons | employee |  |  |  | 326 |  | 326 |  |
Cash flows from financing activities |  |  |  | $ 15,105 | $ (1,461) | $ 85,000 |  |
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 |  |  |  |  |

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