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Summary of Weighted Average Assumptions to Value Stock Options Granted (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term of options       5 years
Expected volatility       114.00%
Expeceted dividends         
Risk-free interest rate       0.85%
Forteitures