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Convertible Senior Notes (Tables) | 3 Months Ended
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Mar. 31, 2018
Carrying Value of Convertible Senior Notes | The carrying value of the Company’s convertible senior notes is as follows:
|  | March 31, 2018 |  |  | December 31, 2017 |
2.125% Convertible Senior Notes due 2021: |  |  |  |  |  |  |  |
Principal amount |  | $ | 114,989 |  |  | $ | 115,000 |
Unamortized debt discount |  |  | (12,513 | ) |  |  | (13,395 | )
Unamortized debt issuance costs |  |  | (2,200 | ) |  |  | (2,355 | )
Total convertible senior notes |  | $ | 100,276 |  |  | $ | 99,250 |

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration