Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Stock Options Activity (Detail)

v2.4.0.8
Common Stock - Summary of Stock Options Activity (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Number of Optioned Common Shares, Beginning Balance 1,007,491  
Number of Optioned Common Shares, Option grants 285,097  
Number of Optioned Common Shares, Option expired (12,169)  
Number of Optioned Common Shares, Option exercises (10,000) (3,475)
Number of Optioned Common Shares, Options forfeitures (11,435)  
Number of Optioned Common Shares, Ending Balance 1,258,984  
Weighted Average Exercise Price, Beginning Balance $ 11.39  
Weighted Average Exercise Price, Option grants $ 11.07  
Weighted Average Exercise Price, Option expired $ 18.93  
Weighted Average Exercise Price, Option exercises $ 3.00  
Weighted Average Exercise Price, Options forfeitures $ 11.92  
Weighted Average Exercise Price, Ending Balance $ 11.24