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Equity Awards and Instruments - Summary of the intrinsic value of options outstanding and exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Intrinsic value of options outstanding and exercisable |  |  |  |
Total pre-tax expense | $ 23,617 | $ 6,046 |  |
Stock Option |  |  |  |
Intrinsic value of options outstanding and exercisable |  |  |  |
Number of Options, Outstanding |  |  | 18,691,667 |
Number of Options, Exercisable |  |  | 7,573,830 |
Weighted Average Exercise Price, Outstanding |  |  | $ 5.97 |
Weighted Average Exercise Price, Exercisable |  |  | $ 5.05 |
Aggregate Intrinsic Value, Outstanding |  |  | $ 91,028 |
Aggregate Intrinsic Value, Exercisable |  |  | $ 43,852 |
Weighted Remaining Contractual Life (in years), Outstanding |  |  | 2 years 7 months 6 days |
Weighted Remaining Contractual Life (in years), Exercisable |  |  | 1 year 7 months 6 days |
Total pre-tax expense | 5,849 | 4,795 | $ 6,342 | $ 4,808
Unrecognized compensation cost related to unvested stock options | $ 7,825 |  | $ 11,911 |
Weighted average period related to unvested stock options (in years) | 1 year 10 months 24 days |  | 2 years 7 months 6 days |
Total intrinsic value of stock options exercised | $ 58,502 | 21,555 | $ 22,914 | 18,291
Restricted stock expense |  |  |  |
Intrinsic value of options outstanding and exercisable |  |  |  |
Total pre-tax expense | $ 2,104 | $ 1,251 | $ 1,749 | $ 3,074

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