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Short-term Investments: Investment in Viking - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2014
Variable Interest Entity [Line Items] |  |  |
Investment in Viking common stock | $ 32.8 | $ 48.4 |
Warrants | $ 1.5 |  |
Exercise price of warrants (USD per share) | $ 1.50 |  | $ 125.08
Equity Method Investee |  |  |
Variable Interest Entity [Line Items] |  |  |
Exercise price of warrants (USD per share) | $ 1.50 |  |
Warrants |  |  |
Variable Interest Entity [Line Items] |  |  |
Warrants investments in Viking | $ 6.3 | $ 9.9 |
Viking Therapeutics, Inc. |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest (as a percent) | 9.80% |  |

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