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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Notes Payable | Total convertible notes payable consisted of the following at (in thousands):
|  | March 31, 2019 |  |  | December 31, 2018 |
Principal amount of the Notes |  | $ | 325,000 |  |  | $ | 325,000 |
Unamortized debt issuance costs |  |  | (5,457 | ) |  |  | (5,813 | )
Total convertible notes payable |  | $ | 319,543 |  |  | $ | 319,187 |
Interest Expense | Interest expense incurred in connection with the Notes consisted of the following (in thousands):
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Coupon interest at 3.75% |  | $ | 3,047 |  |  | $ | 3,047 |
Amortization of debt issuance costs |  |  | 356 |  |  |  | 356 |
Total interest expense on the Notes |  | $ | 3,403 |  |  | $ | 3,403 |

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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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