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Stock based compensation - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
May 12, 2020
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options, outstanding number   843,942 843,942  
Weighted average exercise price   $ 9.97 $ 9.97  
Weighted average contractual life remaining     9 years 6 months 25 days  
Unrecognized stock-based compensation recognition period     Feb. 27, 2022  
Non-Employee Director [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation awards granted 117,192      
Share-based compensation arrangement by share-based payment award, award requisite service period 1 year      
Aggregate fair value of stock-based compensation $ 600,000      
Stock options awarded, value       $ 0
2019 Omnibus Incentive Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Payments based on the value of its common stock   2,000,000 2,000,000  
Restricted Stock Units [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of units, vested   264,991    
Employee Stock Option [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of units, vested   125,414    
Weighted average strike price   $ 17.00 $ 17.00