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Nature of the Business and Operations and Liquidity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 Employee | Jun. 30, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Jun. 05, 2012 Senior Secured Loan | Nov. 15, 2013 New Term Loan | Jun. 30, 2014 MLV & Co. LLC Atm Arrangement | Nov. 15, 2013 MLV & Co. LLC Atm Arrangement
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Accumulated deficit | $ (869,906,000) |  | $ (856,389,000) |  |  |  |  |
Cash and cash equivalents | 36,624,000 | 32,608,000 | 43,114,000 | 39,243,000 |  |  |  |
Net cash used in operating activities | (5,506,000) | (9,307,000) |  |  |  |  |  |
Number of workforce persons | 281 |  |  |  |  |  |  |
Debt, face amount |  |  |  |  | 10,000,000 | 10,000,000 |  |
Common stock | 816,000 |  | 789,000 |  |  |  |  | 30,000,000
Net proceeds from sale of common stock |  |  |  |  |  |  | 1,200,000 |
Sale of common stock |  |  |  |  |  |  | 0.8 |
Average sale price of share |  |  |  |  |  |  | $ 1.63 |
Common Stock, Value, Outstanding |  |  |  |  |  |  | $ 20,800,000 |

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