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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Feb. 10, 2020 | Dec. 31, 2019 | Apr. 15, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term portion of notes payable | $ 104,867,000 |  | $ 104,867,000 |  |  | $ 62,414,000 |
Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Contractual interest expense | 1,017,000 | $ 900,000 | 3,009,000 | $ 1,650,000 |  |  |
Amortization of debt issuance costs and discount | 1,126,000 | 882,000 | 3,205,000 | 1,628,000 |  |  |
Total interest expense | 2,143,000 | $ 1,782,000 | 6,214,000 | $ 3,278,000 |  |  |
Convertible Notes | Convertible Senior Notes due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount of notes outstanding | 13,750,000 |  | 13,750,000 |  |  |  | $ 80,000,000.0
Unamortized discount (including unamortized debt issuance cost) | (2,787,000) |  | (2,787,000) |  |  |  |
Total long-term portion of notes payable | 10,963,000 |  | 10,963,000 |  |  |  |
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 (including unamortized debt issuance cost) | (26,968,000) |  | (26,968,000) |  |  |  |
Total long-term portion of notes payable | $ 93,032,000 |  | $ 93,032,000 |  |  |  |

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