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Basic and Diluted Net Loss Per Common Share - Computations of Diluted Weighted Average Shares Outstanding (Detail) (Equity Option [Member])
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Equity Option [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 2,574 2,294