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Stockholders' equity - Narrative (Details)
May 14, 2020
shares
Mar. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class of Stock [Line Items]      
Capital stock authorized (shares)   500,000,000  
Common stock authorized (shares)   450,000,000 450,000,000
Common stock par value (USD per share) | $ / shares   $ 0.01 $ 0.01
Preferred stock authorized (shares)   50,000,000 50,000,000
Preferred stock par value (USD per share) | $ / shares   $ 0.01 $ 0.01
Forecast | Minimum      
Class of Stock [Line Items]      
Common stock authorized (shares) 22,500,000    
Conversation ratio of reverse stock split 0.05    
Forecast | Maximum      
Class of Stock [Line Items]      
Common stock authorized (shares) 90,000,000    
Conversation ratio of reverse stock split 0.2