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Financial Instruments and Fair Value Measurements - Equity Investment in Armata (Details) - Armata $ / shares in Units, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 26, 2021 USD ($) shares | Mar. 31, 2021 USD ($) tranche director $ / shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($)
Equity investment |  |  |  |
Equity investment ownership percentage |  | 59.60% |  |
Percentage of maximum voting rights |  | 49.50% |  |
Number of Investee's Board members currently representing the Company | director |  | 3 |  |
Number of the Investee's Board members | director |  | 8 |  |
Change in fair value of common stock and warrants |  | $ 61.2 | $ 21.9 |
Common stock and warrants |  |  |  |
Equity investment |  |  |  |
Payments to acquire equity securities |  |  | $ 25.0 |
Fair value of equity securities |  | 125.3 |  | $ 44.0
Common stock |  |  |  |
Equity investment |  |  |  |
Number of shares purchased under the securities purchase agreement | shares |  |  | 8,710,800 |
Fair value of equity securities |  | 71.1 |  | 26.0
Warrants |  |  |  |
Equity investment |  |  |  |
Number of warrants purchased under the securities purchase agreement | shares |  |  | 8,710,800 |
Fair value of equity securities |  | $ 54.2 |  | $ 18.0
Warrants purchased in 2020 |  |  |  |
Equity investment |  |  |  |
Exercise price of warrants | $ / shares |  |  | $ 2.87 |
Term of warrants |  |  | 5 years |
Warrants purchased in 2021 |  |  |  |
Equity investment |  |  |  |
Exercise price of warrants | $ / shares |  | $ 3.25 |  |
Term of warrants |  | 5 years |  |
Innoviva Strategic Opportunities, LLC |  |  |  |
Equity investment |  |  |  |
Number of tranches | tranche |  | 2 |  |
Innoviva Strategic Opportunities, LLC | Common stock and warrants |  |  |  |
Equity investment |  |  |  |
Amount of securities purchase agreement | $ 20.0 |  |  |
Innoviva Strategic Opportunities, LLC | Common stock |  |  |  |
Equity investment |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares | 6,153,847 |  |  |
Innoviva Strategic Opportunities, LLC | Warrants |  |  |  |
Equity investment |  |  |  |
Number of warrants to be purchased under the securities purchase agreement | shares | 6,153,847 |  |  |

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