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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, 2017 USD ($) | Dec. 31, 2016 USD ($)
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 |  |  | 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 |  |  |  | $ 115,800,000 |
Remaining contractual life of the convertible notes |  |  |  | 5 years 1 month 17 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 |  |  |
Proceeds from lines of credit | $ 40,000,000 |  |  |  |
Line of credit facility, additional capacity available, net product revenue threshold |  | 20,000,000 |  |  |
Line of credit facility, net product revenue threshold, additional capacity |  | $ 120,000,000 |  |  |
Line of credit facility, net product revenue threshold, additional capacity, trailing period |  | 12 months |  |  |
Debt issuance costs |  | $ 400,000 |  |  |
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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