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Promissory Convertible Note - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 27, 2012 | Aug. 17, 2012 | Feb. 17, 2012 | Dec. 31, 2012
Debt Disclosure [Abstract] |  |  |  |
Proceeds from issuance of convertible promissory notes and warrants |  |  | $ 3,000 | $ 3,000
Accrued interest rate |  |  | 10.00% |
Debt instrument accrued interests |  | $ 149 |  |
Debt instrument conversion price |  | $ 1 |  |
Shares issued upon conversion | 3,148,833 |  |  |

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