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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 |  |

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