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Debt - Narrative (Details) |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 05, 2017 USD ($) | May 31, 2017 USD ($) | Aug. 31, 2015 USD ($) day $ / shares | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Long-term debt |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 1,667,000 | $ 0 |
Convertible debt | 3.00% Convertible senior notes due 2022 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt principal amount |  |  | $ 150,000,000.0 | 150,000,000 |  | $ 150,000,000
Interest rate ( as a percent ) |  |  | 3.00% |  |  |
Net proceeds from issuance of convertible notes |  |  | $ 145,400,000 |  |  |
Trading days, number | day |  |  | 20 |  |  |
Consecutive trading days, period | day |  |  | 30 |  |  |
Stock price trigger |  |  | 130.00% |  |  |
Business days, period |  |  | 5 days |  |  |
Consecutive trading-day period |  |  | 5 days |  |  |
Common stock per principal amount |  |  | $ 1,000 |  |  |
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day |  |  | 98.00% |  |  |
Conversion ratio |  |  | 17.7487 |  |  |
Conversion price per share (in dollars per share) | $ / shares |  |  | $ 56.34 |  |  |
Convertible instruments principal and unpaid interest payable upon events of default |  |  | 100.00% |  |  |
Minimum percentage of principal held by convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default |  |  | 25.00% |  |  |
Term of the convertible notes |  |  | 7 years |  |  |
Adjustments to additional paid in capital, equity component of convertible debt |  |  | $ 57,500,000 |  |  |
Net deferred tax liability in connection with convertible notes |  |  | $ 22,300,000 |  |  |
Fair value of convertible notes |  |  |  | $ 166,200,000 |  | $ 146,600,000
Remaining contractual life of the convertible notes |  |  |  | 3 years 1 month 6 days |  |
Convertible debt | 3.00% Convertible senior notes due 2022 | Redemption on or after August 20, 2018 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Trading days, number | day |  |  | 19 |  |  |
Consecutive trading days, period | day |  |  | 30 |  |  |
Stock price trigger |  |  | 130.00% |  |  |
Redemption price |  |  | 100.00% |  |  |
Sinking fund |  |  | $ 0 |  |  |
MidCap Financial Trust |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 60,000,000.0 |  |  |  |
Proceeds from lines of credit | $ 40,000,000.0 |  |  |  |  |
Line of credit facility, additional capacity available, net product revenue threshold |  | 20,000,000.0 |  |  |  |
Debt issuance costs |  | $ 400,000 |  |  |  |
Repayments of Debt |  |  |  | $ 1,700,000 |  |
Debt instrument, floor interest rate |  | 1.00% |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.15% |  |  |  |
Debt instrument, interest payment period |  | 24 months |  |  |  |

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- Definition Threshold period of specified consecutive trading days within which the maximum product of the closing sale price of shares of the entity's common stock and the applicable conversion rate for such trading day triggers the conversion feature. + References No definition available. + Details
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