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Convertible Senior Notes - Capped Call and Common Stock Forward (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 18, 2020 | Nov. 30, 2020 | Aug. 31, 2020 | May 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2020 | Jul. 01, 2020 | May 29, 2020 | Sep. 30, 2019 | Mar. 31, 2018
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.50% |  |  |  |  |  |  |  |
Share Price |  | $ 22.25 | $ 10.25 |  | $ 2.75 | $ 2.35 |  |  |  |  |  |
Common stock shares issued |  | 43,700,000 | 35,276,250 |  | 46,000,000 | 10,000,000 | 4,400,000 | 79,000,000.0 |  |  |  |
Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  | 14,397,906 |  |  |  |
3.75% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.75% |  |  | 3.75% |  |  | 3.75% | 3.75% |  | 3.75% |  |
Principal amount | $ 200,000 |  |  | $ 212,463 |  |  | $ 212,463 | $ 212,463 |  | $ 12,500 |  |
Share Price |  |  |  |  |  |  | $ 33.91 | $ 33.91 |  |  |  |
3.75% Convertible Senior Notes | Capped Call |  |  |  |  |  |  |  |  |  |  |  |
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Capped call options amount | $ 16,200 |  |  |  |  |  |  |  |  |  |  |
Cap price | $ 6.7560 |  |  |  |  |  |  |  |  |  |  |
Premium (as a percent) | 60.00% |  |  |  |  |  |  |  |  |  |  |
Share Price | $ 4.11 |  |  |  |  |  |  |  |  |  |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 5.50% |  |  | 5.50% |  |  | 5.50% | 5.50% |  |  |  | 5.50%
Principal amount | $ 100,000 |  |  |  | $ 100,000 |  | $ 160 | $ 160 |  |  |  | $ 100,000
5.5% Convertible Senior Notes | Capped Call |  |  |  |  |  |  |  |  |  |  |  |
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Capped call options amount |  |  |  | $ 16,000 |  |  |  |  |  |  |  |
Cap price |  |  |  | $ 3.82 |  |  |  |  |  |  |  |
Premium (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |
Share Price |  |  |  | $ 1.91 |  |  |  |  |  |  |  |
Recorded in additional paid-in capital |  |  |  | $ 24,200 |  |  |  |  |  |  |  |
7.5% Convertible Senior Note |  |  |  |  |  |  |  |  |  |  |  |
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 7.50% | 7.50% | 7.50% |  | 7.50% |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 40,000 |
7.5% Convertible Senior Note | Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Capped Call and Common Stock Forward |  |  |  |  |  |  |  |  |  |  |  |
Net cost incurred |  |  |  |  |  |  |  | $ 27,500 |  |  |  |

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