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The Company (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2019 | Aug. 31, 2015
--- | --- | --- | --- | ---
Long-term debt |  |  |  |
Retained earnings (accumulated deficit) | $ (1,954,717) | $ (1,628,877) |  |
Convertible debt | 1.50% Convertible senior notes due 2026 |  |  |  |
Long-term debt |  |  |  |
Interest rate ( as a percent ) | 1.50% |  | 1.50% |
Convertible debt | 3.00% Convertible senior notes due 2022 |  |  |  |
Long-term debt |  |  |  |
Interest rate ( as a percent ) |  |  |  | 3.00%

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