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Stock-Based Compensation - Additional Information (Detail)
 9 Months Ended 9 Months Ended
Sep. 30, 2013
Incentive Stock Option Plan [Member]
May 31, 2013
Incentive Stock Option Plan [Member]
Sep. 30, 2013
Incentive Stock Option Plan [Member]
Minimum [Member]
Sep. 30, 2013
Non Employee Directors Stock Option Plan [Member]
Sep. 30, 2012
Non Employee Directors Stock Option Plan [Member]
May 31, 2009
Non Employee Directors Stock Option Plan [Member]
Sep. 30, 2013
Non Employee Directors Stock Option Plan [Member]
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares to be issued under incentive stock option plan   3,000,000       205,000  
Shares for future grants 185,860     5,000      
Option exercisable rate 25.00%     25.00%      
Option exercisable period 4 years     4 years      
Options expire period 15 years     15 years      
Share based compensation options exercisable period 2020     2017      
Stock price percentage to fair value at grant date     100.00%       100.00%
Vesting period in years 7 years     4 years      
Options vest and exercisable Description The options vest and are exercisable beginning four years from the date of grant at the rate of 25% per year for four years. Options expire at the end of fifteen years from the date of grant     The options vest and are exercisable beginning one year from the date of grant at the rate of 25% per year for four years.      
Stock option plan termination date Dec. 31, 2014            
Number of options granted for non-employee director         10,000