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Basic and Diluted Net Loss Per Share (Parenthetical) (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Anti-dilutive securities excluded from computation of earning per share 5,293,145 7,371,471 5,293,145 7,371,471