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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Feb. 10, 2020 | Dec. 31, 2019 | Apr. 15, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term portion of notes payable | $ 103,849,000 |  | $ 103,849,000 |  |  | $ 62,414,000 |
Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Contractual interest expense | 1,000,000 | $ 498,000 | 2,015,000 | $ 644,000 |  |  |
Amortization of debt issuance costs and discount | 1,102,000 | 746,000 | 2,059,000 | 746,000 |  |  |
Total interest expense | 2,102,000 | $ 1,244,000 | 4,074,000 | $ 1,390,000 |  |  |
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) | (3,055,000) |  | (3,055,000) |  |  |  |
Total long-term portion of notes payable | 10,695,000 |  | 10,695,000 |  |  |  |
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) | (27,884,000) |  | (27,884,000) |  |  |  |
Total long-term portion of notes payable | $ 92,116,000 |  | $ 92,116,000 |  |  |  |

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