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Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Shares    
Beginning Balance 3,091,474 1,965,748
Granted 800,000 1,676,712
Forfeited/Cancelled (299,683) (334,543)
Exercised (51,830) (216,443)
Ending Balance 3,539,961 3,091,474
Exercisable, December 31, 2012 2,067,910  
Weighted Average Exercise Price    
Beginning Balance $ 6.83 $ 6.42
Granted $ 2.13 $ 7.02
Forfeited/Cancelled $ 8.93 $ 8.93
Exercised $ 2.31 $ 1.21
Ending Balance $ 5.66 $ 6.83
Exercisable, December 31, 2012 $ 5.96  
Weighted Average Remaining Contractual Life (Years)    
Outstanding, December 31, 2012 6 years 9 months 15 days  
Exercisable, December 31, 2012 5 years 4 months 28 days  
Stock Options Aggregate Intrinsic Value    
Outstanding, December 31, 2012 $ 279  
Exercisable, December 31, 2012 $ 268