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Net Loss per Share - Computation of Basic and Diluted Loss per Share (Parenthetical) (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Options to purchase shares of Common Stock not included in the computation of diluted income per share 2,038,599 861,958 2,038,599 733,120