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Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Components of consolidated balance sheets associated with convertible senior notes | The following summarizes (in thousands) components of our consolidated balance sheets associated with our convertible senior notes:
| As of
| December 31, 2017 |  | December 31, 2016
Face amount of 5.875% convertible senior notes | $ | 88,280 |  |  | $ | 88,280 |
Discount | (26,887 | ) |  | (27,489 | )
Net carrying value | $ | 61,393 |  |  | $ | 60,791 |
Carrying amount of equity component included in additional paid-in capital | $ | 108,714 |  |  | $ | 108,714 |
Excess of instruments’ if-converted values over face principal amounts | $ | — |  |  | $ | — |

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