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Convertible debt (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Debt [Table Text Block] | The following is a summary of the Company's convertible senior notes as of June 30, 2020 (in thousands):
| Date of Issuance |  | Unpaid Principal Balance |  | Net Carrying Amount |  |  |  | Contractual Interest Rates
|  |  |  |  | Current |  | Noncurrent |  |
1% Convertible Notes due in 2024 ("2024 Notes") | May 2019 |  | $ | 143,750 |  |  | $ | — |  |  | $ | 114,131 |  |  | 1%
Convertible Debt [Table Text Block] | The 2024 Notes consist of the following (in thousands):
| June 30, 2020 |  | December 31, 2019
Liability component: |  |  |
Principal | $ | 143,750 |  |  | $ | 143,750 |
Less: debt discount and issuance cost, net of amortization | (29,619) |  |  | (33,046) |
Net carrying amount | $ | 114,131 |  |  | $ | 110,704 |
Equity component(1) | $ | 32,883 |  |  | $ | 32,883 |
(1) Recorded within additional paid-in capital in the unaudited condensed consolidated balance sheet. As of June 30, 2020 and December 31, 2019, it included $32.9 million related to the 2024 Notes, which was net of $1.1 million issuance cost in equity. The following table sets forth total interest expense recognized related to the Notes (in thousands):
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Coupon interest | $ | 359 |  |  | $ | 1,106 |  |  | $ | 719 |  |  | $ | 2,356 |
Amortization of debt issuance costs | 158 |  |  | 341 |  |  | 314 |  |  | 706 |
Amortization of debt discount | 1,568 |  |  | 2,827 |  |  | 3,114 |  |  | 5,568 |
Total | $ | 2,085 |  |  | $ | 4,274 |  |  | $ | 4,147 |  |  | $ | 8,630 |

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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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- References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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