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The Company - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 23, 2018 USD ($) shares | Apr. 20, 2017 USD ($) shares | Aug. 31, 2014 member_state | Jun. 30, 2019 USD ($) product country | Dec. 31, 2018 USD ($) | Aug. 31, 2015
Long-term debt |  |  |  |  |  |
Number of products | product |  |  |  | 2 |  |
Number of member states of the European Economic Area | member_state |  |  | 31 |  |  |
Retained earnings (accumulated deficit) |  |  |  | $ (1,052,825) | $ (938,923) |
Convertible debt | 3.00% Convertible senior notes due 2022 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Interest rate ( as a percent ) |  |  |  |  |  | 3.00%
Non-collaborative Arrangement Transactions | Marathon Pharmaceuticals, LLC |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Cash consideration |  | $ 75,000 |  |  |  |
Equity Interest Issued, number of shares (in shares) | shares |  | 6,683,598 |  |  |  |
Numerator for calculation of number of shares of equity interests issued to acquire entity |  | $ 65,000 |  |  |  |
Trading day period |  | 15 days |  |  |  |
Development milestone payments which the entity is obligated to pay |  | $ 50,000 |  |  |  |
Translarna |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Number of countries ( over ) | country |  |  |  | 40 |  |
Agilis |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Cash consideration | $ 49,200 |  |  |  |  |
Equity Interest Issued, number of shares (in shares) | shares | 3,500,907 |  |  |  |  |
Numerator for calculation of number of shares of equity interests issued to acquire entity | $ 150,000 |  |  |  |  |
Trading day period | 10 days |  |  |  |  |
Development milestone payments which the entity is obligated to pay | $ 40,000 |  |  |  |  |
Agilis | Non-collaborative Arrangement Transactions |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  |  |  | $ 40,000 |  |

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