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Nature of the Business and Operations and Liquidity - Additional Information (Detail) Share data in Millions, except Per Share data, unless otherwise specified | 6 Months Ended |  |  |  | 0 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 USD ($) Employee | Sep. 30, 2013 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2013 USD ($) | Nov. 15, 2013 New Term Loan USD ($) | Aug. 29, 2014 Ghodawat Energy Pvt Ltd USD ($) | Aug. 29, 2014 Ghodawat Energy Pvt Ltd EUR (€) | Jun. 05, 2012 Hercules Senior Secured Loan USD ($) | Sep. 30, 2014 MLV & Co. LLC Atm Arrangement USD ($) | Nov. 15, 2013 MLV & Co. LLC Atm Arrangement USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ (895,328,000) |  | $ (856,389,000) |  |  |  |  |  |  |
Cash and cash equivalents | 34,679,000 | 25,867,000 | 43,114,000 | 39,243,000 |  |  |  |  |  |
Net cash used in operating activities | 11,369,000 | 14,779,000 |  |  |  |  |  |  |  |
Liability for damages |  |  |  |  |  | 10,600,000 | 8,300,000 |  |  |
Interest rate accrued on liability for damage |  |  |  |  |  | 5.33% | 5.33% |  |  |
Number of workforce persons | 291 |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  | 10,000,000 |  |  | 10,000,000 |  |
Common stock |  |  |  |  |  |  |  |  |  | 30,000,000
Net proceeds from sale of common stock |  |  |  |  |  |  |  |  | 3,700,000 |
Sale of common stock |  |  |  |  |  |  |  |  | 2.1 |
Average sale price of share |  |  |  |  |  |  |  |  | $ 1.75 |
Common Stock, Value, Outstanding |  |  |  |  |  |  |  |  | $ 17,100,000 |

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