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v3.10.0.1

Debt (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 USD ($) | Jan. 31, 2018 USD ($) day $ / shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt |  |  |  |  |  |
Underwriting discounts and commissions and other offering expenses |  |  |  | $ 8,440,000 |  |
Proceeds from issuance of 1.75% convertible senior notes due 2025 |  |  |  | 450,000,000 | $ 0 | $ 0
Interest expense |  |  |  | 25,472,000 | 5,925,000 | 3,498,000
Repayments of debt |  |  |  | 55,000,000 | 0 | 0
Loss on extinguishment of debt |  |  | $ 2,200,000 | 2,209,000 | $ 0 | $ 0
1.75% Convertible Senior Note Due 2025 |  |  |  |  |  |
Debt |  |  |  |  |  |
Initial conversion rate |  | 0.0255384 |  |  |  |
A&R Loan Agreement |  |  |  |  |  |
Debt |  |  |  |  |  |
Repayments of debt | $ 55,000,000.0 |  |  |  |  |
Repayments of debt, back end fees, outstanding interest, and prepayment penalty fees | $ 3,200,000 |  |  |  |  |
Convertible Notes Payable |  |  |  |  |  |
Debt |  |  |  |  |  |
Aggregate principal amount |  |  |  | 450,000,000.0 |  |
Convertible Notes Payable | 1.75% Convertible Senior Note Due 2025 |  |  |  |  |  |
Debt |  |  |  |  |  |
Aggregate principal amount |  | $ 450,000,000.0 |  |  |  |
Option to purchase additional debt |  | 50,000,000.0 |  |  |  |
Underwriting discounts and commissions and other offering expenses |  | 14,200,000 |  |  |  |
Proceeds from issuance of 1.75% convertible senior notes due 2025 |  | $ 435,800,000 |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  | $ 39.16 |  |  |  |
Convertible notes ($450.0 face value) |  | $ 309,100,000 |  |  |  |
Effective interest rate |  | 7.60% |  |  |  |
Equity component of convertible debt |  | $ 140,900,000 |  |  |  |
Remaining discount amortization period |  | 6 years 14 days |  |  |  |
Interest expense |  |  |  | $ 25,500,000 |  |
Conversion Term (i) | Convertible Notes Payable | 1.75% Convertible Senior Note Due 2025 |  |  |  |  |  |
Debt |  |  |  |  |  |
Threshold trading days | day |  | 5 |  |  |  |
Threshold consecutive trading days | day |  | 5 |  |  |  |
Threshold percentage of stock price trigger |  | 98.00% |  |  |  |
Conversion Term (ii) | Convertible Notes Payable | 1.75% Convertible Senior Note Due 2025 |  |  |  |  |  |
Debt |  |  |  |  |  |
Threshold trading days | day |  | 45 |  |  |  |
Threshold consecutive trading days | day |  | 10 |  |  |  |
Threshold percentage of stock price trigger |  | 10.00% |  |  |  |
Conversion Term (iii) | Convertible Notes Payable | 1.75% Convertible Senior Note Due 2025 |  |  |  |  |  |
Debt |  |  |  |  |  |
Threshold trading days following fundamental change | day |  | 30 |  |  |  |
Conversion Term (iv) | Convertible Notes Payable | 1.75% Convertible Senior Note Due 2025 |  |  |  |  |  |
Debt |  |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |
Threshold consecutive trading days | day |  | 30 |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |  |

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