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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) | Dec. 31, 2020 | Jul. 01, 2020 | May 31, 2020 | May 29, 2020 | May 18, 2020 | Sep. 30, 2019 | Mar. 31, 2018
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Interest rate (as a percent) |  |  | 3.50% |  |  |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |
Interest rate (as a percent) | 5.50% |  | 5.50% |  | 5.50% |  | 5.50%
3.75% Convertible Senior Notes |  |  |  |  |  |  |
Interest rate (as a percent) | 3.75% |  | 3.75% | 3.75% | 3.75% |  |
7.5% Convertible Senior Note |  |  |  |  |  |  |
Interest rate (as a percent) | 7.50% | 7.50% |  |  |  | 7.50% |

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