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Share-based compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 10, 2004
Sep. 17, 2014
Aug. 27, 2008
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Aug. 19, 1999
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Share based compensation expense         $ 11,000    
Issuance of stock option to purchase stock       6,000,000      
Common stock reserved for issuance       3,251,340      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 260,747 $ 253,000    
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Intrinsic Value       $ 12,400,000   $ 17,100,000  
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%          
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