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Debt - Schedule of Debt (Details) - Convertible notes - USD ($) | Sep. 30, 2021 | Mar. 16, 2021 | Dec. 31, 2020 | Feb. 28, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total net carrying amount | $ 479,155,000 |  | $ 282,196,000 |
Total net carrying amount | 186,299,000 |  | 121,410,000 |
2026 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal | 400,000,000 |  | 400,000,000 | $ 400,000,000
Unamortized discount | (96,782,000) |  | (110,546,000) |
Unamortized debt issuance costs | (6,354,000) |  | (7,258,000) |
Total net carrying amount | 296,864,000 |  | 282,196,000 |
Proceeds allocated to the conversion options (debt discount) | 125,152,000 |  | 125,152,000 |
Issuance costs | (3,742,000) |  | (3,742,000) | $ (3,742,000)
Total net carrying amount | 121,410,000 |  | 121,410,000 |
2028 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal | 250,000,000 | $ 250,000,000 | 0 |
Unamortized discount | (62,542,000) |  | 0 |
Unamortized debt issuance costs | (5,167,000) |  | 0 |
Total net carrying amount | 182,291,000 |  | 0 |
Proceeds allocated to the conversion options (debt discount) | 66,908,000 |  | 0 |
Issuance costs | (2,019,000) | $ (2,019,000) | 0 |
Total net carrying amount | $ 64,889,000 |  | $ 0 |

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