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Debt - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Feb. 10, 2020 | Dec. 31, 2019 | Apr. 15, 2019
Debt Instrument [Line Items] |  |  |  |  |
Total long-term portion of notes payable | $ 101,916,000 |  |  | $ 62,414,000 |
Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual interest expense | (1,014,000) | $ (146,000) |  |  |
Amortization of debt issuance costs and discount | (958,000) | 0 |  |  |
Total interest expense | (1,972,000) | $ (146,000) |  |  |
Convertible Notes | Convertible Senior Notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of Notes outstanding | 13,750,000 |  |  |  | $ 80,000,000.0
Unamortized discount (including unamortized debt issuance cost) | (3,219,000) |  |  |  |
Total long-term portion of notes payable | 10,531,000 |  |  |  |
Convertible Notes | Convertible Senior Notes Due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of Notes outstanding | 120,000,000 |  | $ 120,000,000.0 |  |
Unamortized discount (including unamortized debt issuance cost) | (29,804,000) |  |  |  |
Total long-term portion of notes payable | $ 90,196,000 |  |  |  |

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