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Convertible Senior Notes - Conversion (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 18, 2020 | May 31, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 29, 2020 | Mar. 31, 2018
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds |  |  | $ 9,024 | $ 27,678 | $ 25,609 | $ 47,568 | $ 57,249 | $ 65,259 | $ 83,668 | $ 76,175 |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 100,000 |  |  |  |  |  |  | 160 | 100,000 |  |  | $ 100,000
Less initial purchasers' discount |  | $ (3,300) |  |  |  |  |  |  |  |  |  |
Less other issuance costs |  | (900) |  |  |  |  |  |  | $ (1,700) |  |  |
3.75% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | 200,000 | 212,463 |  |  |  |  |  | $ 212,463 |  |  | $ 12,500 |
Less initial purchasers' discount | (6,400) | (6,374) |  |  |  |  |  |  |  |  |  |
Less cost of related capped calls |  | (16,253) |  |  |  |  |  |  |  |  |  |
Less other issuance costs | $ (600) | (617) |  |  |  |  |  |  |  |  |  |
Net proceeds |  | $ 189,219 |  |  |  |  |  |  |  |  |  |

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