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Series C Convertible Preferred Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 Series C Convertible Preferred Stock | Dec. 31, 2012 Series C Convertible Preferred Stock
Class of Stock [Line Items] |  |  |  |
Series C Preferred Stock issued March 31, 2011 |  |  | 7,000 | 5,444
Preferred stock principal paid in cash |  |  | (778) | (2,334)
Preferred stock principal paid in common stock | 600,309 | 672,593 | (778) | (778)
Balance |  |  | 5,444 | 2,332
Balance |  |  | $ 61,403 | $ 50,098
Preferred stock principal paid in cash |  |  | (7,780) | (23,340)
Preferred stock principal paid in common stock | 7,780 | 7,780 | (7,780) | (7,780)
Preferred stock accretion of fees and embedded derivative |  |  | 4,255 | 3,491
Balance |  |  | $ 50,098 | $ 22,469

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