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Summary of Significant Accounting Policies - Common Stock Equivalents Excluded in Calculation of Diluted Loss Per Share (Detail) (Stock options [Member])
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive securities excluded from computation of earnings per share 941,279 1,216,463