Quarterly report pursuant to sections 13 or 15(d)

Computations of Basic and Diluted Per Share (Detail)

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Computations of Basic and Diluted Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net loss $ (6,037) $ (3,070) $ (13,999) $ (2,461)
Weighted average common shares outstanding- basic and diluted 183,460,777 182,810,137 183,610,148 183,068,493
Net loss per share:        
Basic and diluted $ (0.03) $ (0.02) $ (0.08) $ (0.01)