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Share-based Compensation - Additional Information (Detail) (USD $)
9 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Maximum
Sep. 30, 2014
Minimum
Sep. 10, 2004
2004 Stock Incentive Plan
Aug. 27, 2008
2008 Stock Incentive Plan
Sep. 17, 2014
2014 Stock Incentive Plan
Sep. 30, 2014
2014 Stock Incentive Plan
Maximum
Sep. 30, 2014
2004 Stock Incentive Plan
Maximum
Sep. 30, 2014
2008 Stock Incentive Plan
Maximum
Aug. 19, 1999
1997 Employee Stock Option Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                        
Share based compensation expense $ 29,000 $ 53,000                    
Issuance of stock option to purchase stock 6,000,000                      
Common stock reserved for issuance 2,511,733         2,500,000 3,000,000 3,000,000       2,000,000
Share-based compensation arrangement by share based payment award options granted contractual term       10 years 5 years              
Stock option awards vesting period 2 years                      
Options granted 10,000 110,000                    
Unrecognized compensation cost related to bon-vested 68,000                      
Plan expiration date           Sep. 10, 2014 Aug. 27, 2018 Sep. 17, 2024       Jun. 11, 2007
Intrinsic value of options exercised     $ 2,816,000                  
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock                 110.00% 110.00% 110.00%