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Stock-Based Compensation - Additional Information (Detail)
 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Non Employee Directors Stock Option Plan [Member]
May 31, 2014
Non Employee Directors Stock Option Plan [Member]
Jun. 30, 2014
Non Employee Directors Stock Option Plan [Member]
Minimum [Member]
Jun. 30, 2014
Incentive Stock Option Plan [Member]
May 31, 2013
Incentive Stock Option Plan [Member]
Jun. 30, 2014
Incentive 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     230,000     3,000,000  
Shares for future grants   30,000     135,860    
Option exercisable rate   25.00%     25.00%    
Option exercisable period   1 year     4 years    
Options expire period   15 years     15 years    
Share based compensation options exercisable period   2017     2021    
Stock price percentage to fair value at grant date       100.00%     100.00%
Options vest and exercisable Description   The options are exercisable beginning one year from the date of grant at the rate of 25% per year for four years.     The options 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.    
Stock option plan termination date         Dec. 31, 2019    
Vesting period in years   4 years     7 years    
Number of options granted for non-employee director 10,000