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Share-based compensation - Additional Information (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 07, 2018
Sep. 17, 2014
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Share based compensation expense     $ 900,000 $ 600,000  
Issuance of stock option to purchase stock     7,000,000    
Common stock reserved for issuance     2,717,400    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 21,600   $ 0
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, Intrinsic Value     $ 11,100 $ 0  
Options granted     524,800 307,355 3,874,200
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%      
2018 Stock Incentive Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Common stock reserved for issuance 4,000,000        
Share based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock 110.00%