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Nature of the Business and Operations and Liquidity - Additional Information (Detail) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 10, 2017 USD ($) | Apr. 04, 2017 | Mar. 24, 2015 | Dec. 31, 2015 USD ($) | Mar. 31, 2017 USD ($) employee | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2017 USD ($) employee | Mar. 31, 2014 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split |  |  | 0.1 |  |  |  |  |  |
Accumulated deficit |  |  |  |  | $ (955,557) | $ (928,184) |  | $ (955,557) |
Cash and cash equivalents |  |  |  |  | 26,784 | 39,330 | $ 20,490 | $ 26,784 | $ 43,114
Net cash used in operating activities |  |  |  |  | $ 11,215 | 4,559 | 32,676 |  |
Number of workforce persons | employee |  |  |  |  | 354 |  |  | 354 |
Cash flows from financing activities |  |  |  |  | $ (1,130) | 18,202 | 8,783 | $ 69,900 |
Proceeds from ATM sales, net |  |  |  |  | 2,527 | $ 0 | $ 5,839 |  |
Minimum |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Expected severance cost |  |  |  |  | 1,500 |  |  | 1,500 |
Maximum |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Expected severance cost |  |  |  |  | $ 2,000 |  |  | $ 2,000 |
Inox Wind Limited |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Strategic agreements value |  |  |  | $ 210,000 |  |  |  |  |
Supply commitment, extension period |  |  |  | 3 years |  |  |  |  |
Inox Wind Limited | Minimum |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Supply commitment, period |  |  |  | 3 years |  |  |  |  |
Inox Wind Limited | Maximum |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Supply commitment, period |  |  |  | 4 years |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated, period percent |  | 8.00% |  |  |  |  |  |  |
Common Stock | Subsequent event |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from additional equity offering | $ 14,700 |  |  |  |  |  |  |  |

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