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Equity and Other Investments and Fair Value Measurements - Equity Investment in ImaginAb (Details) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 14, 2023 USD ($) shares | Mar. 14, 2023 USD ($) shares | Mar. 18, 2021 USD ($) shares | Sep. 30, 2024 USD ($) Director | Sep. 30, 2024 USD ($) Director | Feb. 23, 2024 USD ($) | Dec. 31, 2023 USD ($)
Equity Investment |  |  |  |  |  |  |
Total purchase price |  |  |  | $ 453,500 | $ 453,500 |  | $ 453,500
ImaginAb |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |
Transaction costs to acquire equity securities |  |  | $ 400 |  |  |  |
Number of Investee's Board members currently representing the Company | Director |  |  |  | 1 | 1 |  |
ImaginAb | Consolidated Investees [Member] |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |
Equity investment ownership percentage |  |  |  | 11.80% | 11.80% |  | 12.40%
ImaginAb | Series C preferred stock |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  |  | 4,051,724 |  |  |  |
Amount of securities purchase agreement |  |  | $ 4,700 |  |  |  |
ImaginAb | Series C-2 preferred stock |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares | 405,852 | 270,568 |  |  |  |  |
Amount of securities purchase agreement | $ 600 | $ 600 |  |  |  |  |
ImaginAb | Series C preferred stock, Series C-2 preferred stock and common stock |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |
Equity and long-term investments at fair value |  |  |  | $ 7,600 | $ 7,600 |  | $ 7,600
ImaginAb | ImaginAb Convertible Note |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  | $ 2,700 |
Debt Instrument, annual interest rate |  |  |  |  |  | 10.00% |
Unrealized gain from fair value changes in equity investments |  |  |  | 100 | 400 |  |
Equity and long-term investments at fair value |  |  |  | $ 3,100 | $ 3,100 |  |
ImaginAb | One of ImaginAb's Common Stockholders | Common stock |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  |  | 4,097,157 |  |  |  |
Amount of securities purchase agreement |  |  | $ 1,300 |  |  |  |

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