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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