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Short-term Investments: Investment in Viking - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2014
Variable Interest Entity [Line Items] |  |  |
Warrants | $ 0.0 | $ 1.5 |
Investment in Viking common stock | $ 30.9 | $ 32.8 |
Exercise price of warrants (USD per share) |  | $ 1.50 | $ 125.08
Warrants |  |  |
Variable Interest Entity [Line Items] |  |  |
Value of warrants in Viking |  | $ 6.3 |
Viking Therapeutics, Inc. |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest (as a percent) | 8.60% |  |
Stock sold of equity method investee (in shares) | 0.6 |  |

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