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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Summary of convertible notes | The Convertible Notes consist of the following:
|  | Year ended December 31,
Liability component |  | 2017 |  | 2016
Principal |  | $ | 150,000 |  |  | $ | 150,000 |
Less: Debt issuance costs |  | (2,121 | ) |  | (2,457 | )
Less: Debt discount, net (1) |  | (42,572 | ) |  | (49,327 | )
Net carrying amount |  | $ | 105,307 |  |  | $ | 98,216 |
(1) | Included in the consolidated balance sheets within convertible senior notes (due 2022) and amortized to interest expense over the remaining life of the 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 Convertible Notes:
|  | Year ended December 31,
|  | 2017 |  | 2016
Contractual interest expense |  | $ | 4,500 |  |  | $ | 4,497 |
Amortization of debt issuance costs |  | 337 |  |  | 302 |
Amortization of debt discount |  | 6,755 |  |  | 6,065 |
Total |  | $ | 11,592 |  |  | $ | 10,864 |
Effective interest rate of the liability component |  | 11.0 | % |  | 11.0 | %

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- Definition Tabular disclosure of interest expense recognized related to convertible debt. + References No definition available. + Details
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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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