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Share-based compensation - Additional Information (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 07, 2018
Sep. 17, 2014
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Aug. 27, 2008
Sep. 10, 2004
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Share based compensation expense     $ 600,000 $ 200,000      
Issuance of stock option to purchase stock     7,000,000        
Common stock reserved for issuance     2,884,509        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 0   $ 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     284,800 231,500 3,874,200    
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              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Common stock reserved for issuance           3,000,000  
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%