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Stock-based compensation - Summary of shares available for grant activity (Details) - shares
4 Months Ended 5 Months Ended 9 Months Ended
Mar. 31, 2020
Nov. 20, 2019
Mar. 31, 2020
Nov. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]        
Shares available for grant (in shares)   4,472,000 4,472,000  
Shares available for grant (in shares) 5,164,000   5,164,000  
Equity Incentive Plan 2009 and 2011        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]        
Shares available for grant (in shares) 0      
Additional shares authorized (in shares)   1,667,000    
Granted (in shares)   (1,681,000)    
RSUs withheld for taxes in net share settlements (in shares)   251,000    
Canceled (in shares)   633,000    
Expired (in shares)   (5,342,000)    
Shares available for grant (in shares)   0    
Equity Incentive Plan 2019        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]        
Initial shares authorized under 2019 Plan (in shares) 5,700,000      
Additional shares authorized (in shares) 483,000      
Granted (in shares) (1,019,000)      
Additional shares reserved for future issuance (up to) (in shares) 5,800,000   5,800,000 5,800,000