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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, 2018
Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Share based compensation expense       $ 27,000 $ 0
Issuance of stock option to purchase stock       6,000,000  
Common stock reserved for issuance       2,374,722  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       20,000 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 3,200,000 $ 5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value, Nonvested       0 0
Share based Compensation Arrangement By Share based Payment Award Options Exercisable And Vested Intrinsic Value1       $ 13,950 $ 260,747
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        
2008 Stock Incentive Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Plan expiration date     Aug. 27, 2018    
2014 Stock Incentive Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Common stock reserved for issuance   3,000,000      
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    
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock     110.00%