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Stock Option Activity (Detail) (Stock Option, USD $)
3 Months Ended
Mar. 31, 2013
Stock Option
 
Number of Shares Issuable  
Balance, Beginning 5,710,125
Granted 0
Exercised 0
Cancelled (762,076)
Balance, Ending 4,948,049
Weighted-average exercise price  
Balance, Beginning $ 1.10
Granted $ 0
Exercised $ 0
Cancelled $ 0 [1]
Balance, Ending $ 1.27
[1] less than $0.01