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Organizational restructurings - Narrative (Details)
$ in Thousands
12 Months Ended
Jun. 17, 2020
employee
Sep. 27, 2019
USD ($)
Apr. 08, 2019
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 02, 2019
seniorOfficer
Restructuring Cost and Reserve [Line Items]              
Workforce reduction (positions eliminated) | employee 22            
Organizational restructuring expenses       $ 4,200 $ 16,371 $ 0  
Number of senior officers retired | seniorOfficer             2
Workforce reduction (as a percent)     20.00%        
Chief Executive Officer | One-time Termination Benefits              
Restructuring Cost and Reserve [Line Items]              
Organizational restructuring expenses   $ 5,900          
Period of COBRA employer contributions   18 months