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Basis of presentation and description of business - IPO (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jul. 24, 2020
Nov. 13, 2017
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Acquisitions            
Issuance of common stock (shares) 13,500,000          
Share Price $ 26.00          
Proceeds from initial public offering, net of underwriting discounts and commissions       $ 326,316    
Issuance of common stock $ 319,000          
Underwriting discount and commissions 24,700          
Offering costs $ 7,300     $ 6,601    
Common stock, par value $ 0.001   $ 0.001 $ 0.001   $ 0.001
Common stock, shares authorized 500,000,000   500,000,000 500,000,000   132,000,000
Preferred stock, par value $ 0.001   $ 0.001 $ 0.001   $ 0.001
Preferred stock, shares authorized 50,000,000   50,000,000 50,000,000   0
Proceeds from private placement $ 2,200     $ 2,233    
Repayment of debt 205,000     205,000 $ 4,750  
Accrued interest paid 3,400          
Prepayment penalty 2,000          
Write-off of debt issuance cost 3,200          
Loss on debt extinguishment $ 5,200   $ 5,213 $ 5,213    
Vista Equity Partners [Member]            
Acquisitions            
Aggregate purchase price   $ 733,800        
Ownership, as a percent     72.90% 72.90%    
IPO [Member]            
Acquisitions            
Issuance of common stock     $ 318,993 $ 318,993    
Private Placement [Member]            
Acquisitions            
Issuance of common stock (shares) 85,880          
Issuance of common stock     $ 2,233 $ 2,233