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Fair Value Measurements - Estimated Fair Value of Equity Securities Assumptions (Details) | Sep. 30, 2021 $ / shares | Dec. 31, 2020 $ / shares Y
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Closing Common Stock Price [Member] |  |
Fair Value Measurements |  |
Valuation assumptions, measurement input | $ / shares | 7.48 | 11.99
Discount for Lack of Marketability [Member] | Tranche 1 [Member] |  |
Fair Value Measurements |  |
Valuation assumptions, measurement input |  | 0.12
Discount for Lack of Marketability [Member] | Tranche 2 [Member] |  |
Fair Value Measurements |  |
Valuation assumptions, measurement input |  | 0.14
Estimated time to liquidity of shares | Tranche 1 [Member] |  |
Fair Value Measurements |  |
Valuation assumptions, measurement input | Y |  | 0.25
Estimated time to liquidity of shares | Tranche 2 [Member] |  |
Fair Value Measurements |  |
Valuation assumptions, measurement input | Y |  | 0.67
Rezolute [Member] |  |
Fair Value Measurements |  |
Closing stock price (in dollars per share) | $ / shares | $ 7.48 | $ 11.99

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