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Investment in Viking - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018 | Apr. 30, 2016 | Aug. 31, 2014
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loss recorded (as a percent) | 12.40% |  |  |  |  |
Investment in Viking common stock |  | $ 48,400 |  | $ 46,200 |  |
Warrants |  | 1,500 |  |  |  |
Exercise price of warrants (USD per share) |  |  |  |  |  | $ 125.08
Warrants investments in Viking |  | 58,335 |  | 55,448 |  |
Equity Method Investee |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Increase (decrease) in equity method investment |  |  | $ 2,700 |  |  |
Exercise price of warrants (USD per share) |  |  |  |  | $ 1.50 |
Warrants |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Warrants investments in Viking |  | $ 9,900 |  | $ 9,300 |  |
Viking Therapeutics, Inc. |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  | 10.30% |  |  |  |

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