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Debt Instruments and Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Instruments and Related Party Transactions |
Schedule of liability components of the Convertible Notes | The Convertible Notes consist of the following as of December 31, 2017 and 2016 (In thousands):
Liability component |  | 2017 |  | 2016 |
Principal |  | $ | 250,000 |  | $ | 250,000 |
Less: debt discount (1) |  |  | (81,566 | ) |  | (90,807 | )
Less: deferred financing (1) |  |  | (4,267 | ) |  | (4,729 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net carrying value of the debt |  | $ | 164,167 |  | $ | 154,464 |
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(1) | Included in the Consolidated Balance Sheets within Convertible Senior Notes (due 2023) and amortized to interest expense over the remaining life of the Convertible Senior Notes using the effective interest rate method.
Components of total interest expense recognized related to the Convertible Notes | The following table sets forth total interest expense recognized related to the Convertible Notes for the year ended December 31, 2017 and 2016 (In thousands):
Components |  | 2017 |  | 2016 |
Contractual interest expense |  | $ | 7,528 |  | $ | 208 |
Amortization of deferred financing |  |  | 470 |  |  | 26 |
Amortization of debt discount |  |  | 9,241 |  |  | 248 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 17,239 |  | $ | 482 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective interest rate of the liability component |  |  | 10.85 | % |  | 10.85 | %

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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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- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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