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Long-Term incentive plan - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]    
Long term incentives plan terms Prior to the IPO, the Company’s long-term incentive plan (LTIP) was available for any employee who had been designated to be eligible to participate by the Compensation Committee of the Board of Directors. Annually, the LTIP provided for long-term cash incentive awards to eligible participants based on the Company’s performance over a three-year performance period.  
Long-Term Incentive Plan $ 1,325 $ 1,750
Deferred Bonus [Member]    
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]    
Long-Term Incentive Plan   $ 79
Chief Executive Officer [Member]    
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]    
Increase in fair value of long term incentive plan 12.00%  
Long term incentive plan 3 years