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Convertible Senior Notes, Net - Summary of Note Terms (Details) - Convertible Debt | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Principal Amount | $ 575,000,000 |  |
Conversion rate basis, principal amount | 1,000 |  |
2022 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount | $ 345,000,000 |  | $ 345,000,000.0
Coupon Rate | 4.75% |  | 4.75%
Effective Rate | 5.60% |  |
Conversion Rate | 0.0502260 |  |
Remaining Period of Amortization | 1 year 10 months 24 days |  |
2023 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount | $ 230,000,000 | $ 230,000,000.0 |
Coupon Rate | 5.38% | 5.375% |
Effective Rate | 6.16% |  |
Conversion Rate | 0.0487187 |  |
Remaining Period of Amortization | 3 years 14 days |  |

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