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Share-Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jan. 16, 2015
Sep. 17, 2014
Aug. 27, 2008
Aug. 19, 1999
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Sep. 10, 2004
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share based compensation expense $ 3,000,000       $ 162,000 $ 29,000    
Issuance of stock option to purchase stock         6,000,000      
Common stock reserved for issuance         4,306,523      
Stock option awards vesting period         2 years      
Unrecognized compensation cost related to bon-vested         $ 51,000      
Intrinsic value of options exercised             $ 793,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         9,827 9,827    
Maximum                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based compensation arrangement by share based payment award options granted contractual term         10 years      
Minimum                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based compensation arrangement by share based payment award options granted contractual term         3 years      
2004 Stock Incentive Plan                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Common stock reserved for issuance               2,500,000
2008 Stock Incentive Plan | Maximum                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Expiration period of option awards     10 years          
2008 Stock Incentive Plan | Minimum                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Expiration period of option awards     5 years          
2014 Stock Incentive Plan                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Common stock reserved for issuance   3,000,000            
Plan expiration date   Sep. 17, 2024            
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock   110.00%            
2014 Stock Incentive Plan | Maximum                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Expiration period of option awards   10 years            
2014 Stock Incentive Plan | Minimum                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Expiration period of option awards   5 years            
Stock Option Plan                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Options granted         164,506 10,000 1,055,500  
2008 Stock Incentive Plan                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Common stock reserved for issuance     3,000,000          
Plan expiration date     Aug. 27, 2018          
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock     110.00%          
1997 Employee Stock Option Plan                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Common stock reserved for issuance       2,000,000        
Plan expiration date       Jun. 11, 2007