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Stockholders' equity - Narrative - Shares Available for Grant (Details) - shares
1 Months Ended 7 Months Ended
Nov. 20, 2019
Jul. 01, 2019
Nov. 30, 2019
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total common shares reserved for future issuance (in shares)       9,394,000
2009 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual share increase authorized under 2009 Plan (in shares)   1,666,666    
Expired under 2009 and 2011 Plans (in shares)     5,342,000  
2019 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual share increase authorized under 2009 Plan (in shares)       613,000
Total common shares reserved for future issuance (in shares)     5,700,000  
Additional capital shares reserved for future issuance (in shares)     5,800,000 5,800,000,000
Share-based Compensation Arrangement by Share-based Compensation Award, Termination Period From Date Of Adoption 10 years