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Convertible Notes and Credit Facility - Schedule of Debt (Details) - Convertible Debt - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Nov. 30, 2019 | Mar. 31, 2018 | Feb. 28, 2014
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, total | $ 54,121 | $ 53,821 |  |  |
2.75% 2014 Notes due 2034 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on notes |  |  |  | 2.75% | 2.75%
Principal amount | 1,079 | 1,079 | $ 1,100 | $ 51,300 |
Unamortized debt discount | (17) | (18) |  |  |
Unamortized debt issuance cost | (4) | (4) |  |  | $ (1,100)
Long-term debt, total | 1,058 | 1,057 |  |  |
5.25% 2019 Notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on notes |  |  | 5.25% |  |
Principal amount | 55,000 | 55,000 |  |  |
Unamortized debt issuance cost | (1,937) | (2,236) |  |  |
Long-term debt, total | $ 53,063 | $ 52,764 |  |  |

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