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Share-based compensation - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 07, 2018
Sep. 17, 2014
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Share based compensation expense     $ 100 $ 400  
Issuance of stock option to purchase stock     7,000,000    
Common stock reserved for issuance     77,400    
Options granted     0 258,500 3,164,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 0   $ 700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     0   $ 300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     $ 0 $ 0  
Stock option vesting period     2 years    
Minimum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Contractual term     3 years    
Maximum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Contractual term     10 years    
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%