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Debt - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 17, 2021 | Apr. 08, 2021 | Dec. 31, 2020 | Feb. 10, 2020 | Apr. 15, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total notes payable | $ 6,799,000 |  | $ 6,799,000 |  |  |  | $ 3,082,000 |  |
Contractual interest expense | 3,284,000 | $ 1,017,000 | 7,497,000 | $ 3,009,000 |  |  |  |  |
Amortization of debt issuance costs and discount | 2,118,000 | 1,126,000 | 5,035,000 | 3,205,000 |  |  |  |  |
Total interest expense | 5,402,000 | $ 2,143,000 | 12,532,000 | $ 6,214,000 |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes outstanding |  |  |  |  |  |  | 133,750,000 |  | $ 80,000,000
Unamortized discount and unamortized debt issuance cost |  |  |  |  |  |  | (28,605,000) |  |
Total notes payable |  |  |  |  |  |  | 105,145,000 |  |
Convertible Notes | Convertible Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes outstanding | 13,750,000 |  | 13,750,000 |  |  |  | 13,750,000 |  |
Unamortized discount and unamortized debt issuance cost | (2,089,000) |  | (2,089,000) |  |  |  | (2,619,000) |  |
Total notes payable | 11,661,000 |  | 11,661,000 |  |  |  | 11,131,000 |  |
Convertible Notes | Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes outstanding | 120,000,000 |  | 120,000,000 |  |  |  | 120,000,000 | $ 120,000,000 |
Unamortized discount and unamortized debt issuance cost | (22,918,000) |  | (22,918,000) |  |  |  | (25,986,000) |  |
Total notes payable | 97,082,000 |  | 97,082,000 |  |  |  | $ 94,014,000 |  |
Convertible Notes | Convertible Senior Notes Due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes outstanding | 265,000,000 |  | 265,000,000 |  | $ 265,000,000 |  |  |  |
Unamortized discount and unamortized debt issuance cost | (71,587,000) |  | (71,587,000) |  |  |  |  |  |
Total notes payable | 193,413,000 |  | 193,413,000 |  |  |  |  |  |
Credit Facility | Owl Rock Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes outstanding | 398,750,000 |  | 398,750,000 |  |  | $ 180,000,000 |  |  |
Unamortized discount and unamortized debt issuance cost | (96,594,000) |  | (96,594,000) |  |  |  |  |  |
Total notes payable | $ 302,156,000 |  | $ 302,156,000 |  |  |  |  |  |

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