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Share-based compensation - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Sep. 10, 2004
Sep. 17, 2014
Aug. 27, 2008
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Aug. 19, 1999
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Share based compensation expense       $ 601,000 $ 162,000    
Issuance of stock option to purchase stock       6,000,000      
Common stock reserved for issuance       3,251,340      
Stock option awards vesting period       2 years      
Unrecognized compensation cost related to non-vested       $ 1,000      
Intrinsic value of options exercised           $ 1,309,000  
Maximum | Employee Stock Option [Member]              
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            
Plan expiration date Sep. 10, 2014            
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%          
Stock Option Plan              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Options granted       1,170,534 164,506    
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          
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%        
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        
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