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Debt - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 08, 2021 | Dec. 31, 2020 | Feb. 10, 2020 | Apr. 15, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total long-term portion of notes payable | $ 279,087,000 |  | $ 279,087,000 |  |  | $ 105,844,000 |  |
Contractual interest expense | 3,196,000 | $ 1,000,000 | 4,213,000 | $ 2,015,000 |  |  |  |
Amortization of debt issuance costs and discount | 1,737,000 | 1,102,000 | 2,917,000 | 2,059,000 |  |  |  |
Total interest expense | 4,933,000 | $ 2,102,000 | 7,130,000 | $ 4,074,000 |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of notes outstanding |  |  |  |  |  |  |  | $ 80,000,000.0
Convertible Notes | Convertible Senior Notes due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of notes outstanding | 13,750,000 |  | 13,750,000 |  |  |  |  |
Unamortized discount and unamortized debt issuance cost | (2,271,000) |  | (2,271,000) |  |  |  |  |
Total long-term portion of notes payable | 11,479,000 |  | 11,479,000 |  |  |  |  |
Convertible Notes | Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of notes outstanding | 120,000,000 |  | 120,000,000 |  |  |  | $ 120,000,000.0 |
Unamortized discount and unamortized debt issuance cost | (23,962,000) |  | (23,962,000) |  |  |  |  |
Total long-term portion of notes payable | 96,038,000 |  | 96,038,000 |  |  |  |  |
Credit Facility | Owl Rock Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of notes outstanding | 180,000,000 |  | 180,000,000 |  | $ 180,000,000.0 |  |  |
Unamortized discount and unamortized debt issuance cost | (8,789,000) |  | (8,789,000) |  |  |  |  |
Total long-term portion of notes payable | $ 171,211,000 |  | $ 171,211,000 |  |  |  |  |

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