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Stock Option Activity (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Number of Shares Issuable  
Balance, Ending 4,848,049
Weighted-average exercise price  
Balance, Ending $ 1.29
Stock Option
 
Number of Shares Issuable  
Balance, Beginning 5,710,125
Granted 0
Exercised 0
Expired (862,076)
Balance, Ending 4,848,049
Weighted-average exercise price  
Balance, Beginning $ 1.10
Granted $ 0
Exercised $ 0
Expired $ 0 [1]
Balance, Ending $ 1.29
[1] less than $0.01