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Convertible Senior Notes - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($) | Sep. 30, 2019 | Jun. 30, 2019 | Apr. 15, 2019 | Dec. 31, 2018
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Debt Instrument [Line Items] |  |  |  |
Total long-term portion of notes payable | $ 60,137,000 |  |  | $ 0
Less: Issuance costs |  | $ (1,100,000) |  |
Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of 2024 Notes outstanding | 80,000,000 |  |  |
Unamortized discount (including unamortized debt issuance cost) | (19,863,000) |  |  |
Total long-term portion of notes payable | 60,137,000 |  |  |
Equity component of notes | 17,624,000 |  |  |
Less: Deferred tax liability | (4,065,000) |  |  |
Less: Issuance costs | (1,094,000) |  |  |
Capital in excess of Par Value | 12,465,000 |  |  |
Convertible Notes | Convertible Senior Notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of 2024 Notes outstanding |  |  | $ 80,000,000.0 |
Equity component of notes |  |  | $ 17,600,000 |
Less: Issuance costs | $ (1,100,000) |  |  |

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