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Debt - (Tables) | 9 Months Ended
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Sep. 30, 2019
1.50% Convertible senior notes due 2026 |
Debt Instrument, Redemption [Line Items] |
Summary of convertible notes | The 2026 Convertible Notes consist of the following:
Liability component |  | September 30, 2019
Principal |  | $ | 287,500 |
Less: Debt issuance costs |  | (4,692 | )
Less: Debt discount, net(1) |  | (122,618 | )
Net carrying amount |  | $ | 160,190 |
(1) Included in the consolidated balance sheets within convertible senior notes (due 2026) and amortized to interest expense over the remaining life of the 2026 Convertible Notes using the effective interest rate method.
Summary of interest expense recognized related to the Convertible Notes | The following table sets forth total interest expense recognized related to the 2026 Convertible Notes:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2019 |  | 2019
Contractual interest expense |  | $ | 130 |  |  | $ | 130 |
Amortization of debt issuance costs |  | 15 |  |  | 15 |
Amortization of debt discount |  | 391 |  |  | 391 |
Total |  | $ | 536 |  |  | $ | 536 |
Effective interest rate of the liability component |  | 10.2 | % |  | 10.2 | %
3.00% Convertible senior notes due 2022 |
Debt Instrument, Redemption [Line Items] |
Summary of convertible notes | The 2022 Convertible Notes consist of the following:
Liability component |  | September 30, 2019 |  | December 31, 2018
Principal |  | $ | 150,000 |  |  | $ | 150,000 |
Less: Debt issuance costs |  | (1,438 | ) |  | (1,746 | )
Less: Debt discount, net(1) |  | (28,862 | ) |  | (35,054 | )
Net carrying amount |  | $ | 119,700 |  |  | $ | 113,200 |
(1) Included in the consolidated balance sheets within convertible senior notes (due 2022) and amortized to interest expense over the remaining life of the 2022 Convertible Notes using the effective interest rate method.
Summary of interest expense recognized related to the Convertible Notes | The following table sets forth total interest expense recognized related to the 2022 Convertible Notes:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Contractual interest expense |  | $ | 1,134 |  |  | $ | 1,134 |  |  | $ | 3,375 |  |  | $ | 3,375 |
Amortization of debt issuance costs |  | 106 |  |  | 95 |  |  | 308 |  |  | 277 |
Amortization of debt discount |  | 2,137 |  |  | 1,919 |  |  | 6,192 |  |  | 5,563 |
Total |  | $ | 3,377 |  |  | $ | 3,148 |  |  | $ | 9,875 |  |  | $ | 9,215 |
Effective interest rate of the liability component |  | 11.0 | % |  | 11.0 | % |  | 11.0 | % |  | 11.0 | %

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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