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Debt - Summary of convertible notes (Details) - Convertible debt - USD ($) | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Aug. 31, 2015
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Convertible Senior Notes, 1.5%, Due September 15, 2026 |  |  |  |
Long-term debt |  |  |  |
Principal | $ 287,500,000 | $ 287,500,000 |  |
Less: Debt issuance costs | (4,567,000) |  |  |
Less: Debt discount, net | (119,350,000) |  |  |
Net carrying amount | 163,583,000 |  |  |
3.00% Convertible senior notes due 2022 |  |  |  |
Long-term debt |  |  |  |
Principal | 150,000,000 |  | $ 150,000,000 | $ 150,000,000.0
Less: Debt issuance costs | (1,329,000) |  | (1,746,000) |
Less: Debt discount, net | (26,686,000) |  | (35,054,000) |
Net carrying amount | $ 121,985,000 |  | $ 113,200,000 |

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