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Convertible Senior Notes - Net proceeds (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Jul. 01, 2020 shares | May 18, 2020 USD ($) D $ / shares | Feb. 28, 2021 USD ($) shares | Jan. 31, 2021 USD ($) shares | Nov. 30, 2020 $ / shares shares | Aug. 31, 2020 $ / shares shares | May 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Mar. 31, 2019 $ / shares shares | Feb. 28, 2021 USD ($) shares | Dec. 31, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | May 29, 2020 USD ($) | Mar. 31, 2018 USD ($)
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,024 |  |  | $ 27,678 | $ 25,609 | $ 47,568 | $ 57,249 | $ 65,259 | $ 83,668 | $ 76,175 |  |
Aggregate consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,238 |  | 90,238 |  | 90,238 |  |  |  |
Conversion of convertible notes to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,553 |  |  |  |
Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 85,600 |  |  |  |  |  |  |  |  | 85,600 |  |  |  |
Convertible senior note |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 441 |  |  | 441 |  | 43,058 | 1,883 | 1,179 | 28,392 |  |  |
Proceeds from issuance of convertible senior notes, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205,100 |  | 205,098 | 39,052 | 205,098 | 39,052 | $ 95,856 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,222 |  | $ (518) | $ (518) | $ 13,222 | $ (518) | $ 13,222 | (518) | $ 17,686 | $ (518) |  |  |
Closing price of the company's stock | $ / shares |  |  |  |  | $ 22.25 | $ 10.25 |  | $ 2.75 |  | $ 2.35 |  |  |  |  |  | $ 2.35 |  |  |  |  |  | $ 2.75 |  |  |
Common stock shares issued | shares |  |  |  |  | 43,700,000 | 35,276,250 |  | 46,000,000 |  | 10,000,000 |  | 4,400,000 |  |  |  |  |  |  |  |  | 79,000,000.0 |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  |  |  |  |  |  |  |  |  |  | 32.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of convertible senior notes |  |  |  |  |  |  |  | $ 53,455 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,455 |  |  |
3.75% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 200,000 |  |  |  |  | $ 212,463 |  |  |  |  | $ 212,463 |  |  |  |  |  |  |  |  | $ 212,463 |  |  | $ 12,500 |
Interest rate (as a percent) |  | 3.75% |  |  |  |  | 3.75% |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  | 3.75% |  |  | 3.75% |
Net proceeds |  |  |  |  |  |  | $ 189,219 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity principal amount |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rates for the notes (in shares) |  | 198.6196 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price, per share | $ / shares |  | $ 5.03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days | D |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consecutive trading days | D |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (as a percent) |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business days |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount (as a percent) |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount to be redeemed |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the liability component |  | $ 75,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the equity component |  | $ 130,300 |  |  |  |  |  |  |  |  |  | $ 130,249 |  |  |  |  |  |  |  |  | $ 130,249 |  |  |  |
Effective interest rate (as a percent) |  | 29.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs for issuance |  | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial purchasers' discount |  | 6,400 |  |  |  |  | 6,374 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other issuance costs |  | 600 |  |  |  |  | 617 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs attributable to the liability component |  | 2,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs attributable to the equity component |  | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing price of the company's stock | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 33.91 |  |  |  |  |  |  |  |  | $ 33.91 |  |  |  |
Fair value of convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  |  |
3.75% Convertible Senior Notes | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.75% | 3.75% |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes through common stock issuance | shares |  |  | 3,000,000.0 | 3,000,000.0 |  |  |  |  |  |  | 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior note |  |  | $ 15,200 | $ 15,200 |  |  |  |  |  |  | $ 15,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.75% Convertible Senior Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption notice days |  | 1 day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.75% Convertible Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption notice days |  | 3 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.75% Convertible Senior Notes | Private placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 212,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7.5% Convertible Senior Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 40,000 |  |  |  |  |  | $ 40,000 |  |  |  |  | $ 40,000 |  |  |  |  |
Interest rate (as a percent) | 7.50% |  |  |  |  |  |  |  | 7.50% |  |  | 7.50% |  |  | 7.50% |  |  |  |  | 7.50% | 7.50% |  |  |  |
Conversion of notes through common stock issuance | shares | 16,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity principal amount |  |  |  |  |  |  |  |  | $ 48,000 |  |  |  |  |  | $ 48,000 |  |  |  |  | $ 48,000 |  |  |  |  |
Proceeds from issuance of convertible senior notes, net |  |  |  |  |  |  |  |  | $ 39,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount to be redeemed |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 100,000 |  |  |  |  |  | 100,000 |  |  |  | $ 160 |  |  |  |  |  |  |  |  | $ 160 | 100,000 |  |  | $ 100,000
Interest rate (as a percent) |  | 5.50% |  |  |  |  | 5.50% |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  | 5.50% |  |  |  | 5.50%
Repurchase of convertible senior notes | shares |  |  |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate repurchase of debt |  |  |  |  |  |  | $ 128,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate consideration |  |  |  |  |  |  | 90,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes through common stock issuance | shares |  |  |  |  |  |  |  |  |  |  |  | 14,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt component of debt exchange |  |  |  |  |  |  | 35,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component of debt exchange |  |  |  |  |  |  | $ 93,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for fair value of liability |  |  |  |  |  |  | 29.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term borrowings |  |  |  |  |  |  | $ 48,700 |  |  |  |  | $ 160 |  |  |  |  |  |  |  |  | $ 160 |  |  |  |
Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | 33,500 |  |  |  |  |  |  |  |  | $ 33,500 |  |  |  |
Maturity principal amount |  |  |  |  |  |  | 66,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on early debt extinguishment |  |  |  |  |  |  | $ 13,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount to be redeemed |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the liability component |  |  |  |  |  |  | $ 58,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the equity component |  |  |  |  |  |  | $ 37,700 | $ 37,702 |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,702 |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs for issuance |  |  |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial purchasers' discount |  |  |  |  |  |  | 3,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other issuance costs |  |  |  |  |  |  | 900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700 |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | $ 4,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs attributable to the liability component |  |  |  |  |  |  | 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs attributable to the equity component |  |  |  |  |  |  | $ 1,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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