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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Notes Payable | Total convertible notes payable consisted of the following at (in thousands):
|  | December 31, |  | December 31, |
|  | 2016 |  | 2015 |
Principal amount of Notes |  | $ | 325,000 |  | $ | — |
Unamortized debt issuance costs |  |  | (8,661) |  |  | — |
Total convertible notes payable |  | $ | 316,339 |  | $ | — |
Interest Expense | Interest expense incurred in connection with the Notes consisted of the following for the years ended December 31 (in thousands):
|  | 2016 |  | 2015 |
Coupon interest |  | $ | 11,240 |  | $ | — |
Amortization of debt issuance costs |  |  | 1,305 |  |  | — |
Total interest expense on Notes |  | $ | 12,545 |  | $ | — |

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