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Nature of the Business and Operations and Liquidity - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 6 Months Ended | 42 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 06, 2015 USD ($) | Apr. 29, 2015 USD ($) | Mar. 24, 2015 | Nov. 13, 2014 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) Employee | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Employee | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  | 0.1 |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | $ (921,864,000) |  | $ (921,864,000) | $ (905,045,000) |
Cash and cash equivalents |  |  |  |  |  | 32,572,000 | $ 34,679,000 | $ 32,572,000 | $ 20,490,000 | $ 43,114,000
Net cash used in operating activities |  |  |  |  |  | $ 7,767,000 | 11,369,000 |  |  |
Number of workforce persons | Employee |  |  |  |  |  | 303 |  | 303 |  |
Cash flows from financing activities |  |  |  |  |  | $ 20,202,000 | 844,000 | $ 74,000,000 |  |
Proceeds from additional equity offering |  | $ 22,300,000 |  | $ 9,100,000 |  |  |  |  |  |
Net proceeds from sale of ownership interest |  |  |  |  |  | (356,000) | (410,000) |  |  |
Tres Amigas |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of ownership interest |  |  |  |  |  | (356,000) |  |  |  |
Impairment charge on investment |  |  |  |  | $ 700,000 | $ 746,000 |  |  |  |
Blade Dynamics Ltd |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment charge on investment |  |  |  |  |  |  | $ 3,500,000 |  |  |
Blade Dynamics Ltd | Subsequent Event |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding common stock | 100.00% |  |  |  |  |  |  |  |  |
Net proceeds from sale of ownership interest | $ 2,500,000 |  |  |  |  |  |  |  |  |
Milestone achievement period | 3 years |  |  |  |  |  |  |  |  |
Blade Dynamics Ltd | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |
Additional proceeds receivable upon successful achievement of certain milestones | $ 1,600,000 |  |  |  |  |  |  |  |  |

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