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Financial Instruments and Fair Value Measurements - Equity Investment in ImaginAb (Details) - ImaginAb $ in Millions | Mar. 18, 2021 USD ($) shares | Jun. 30, 2021 USD ($) | Apr. 28, 2021 director
--- | --- | --- | ---
Equity Investment |  |  |
Transaction costs to acquire equity securities | $ 0.4 |  |
Equity investment ownership percentage |  | 12.50% |
Number of Investee's Board members currently representing the Company | director |  |  | 1
Number of the Investee's Board members | director |  |  | 5
Equity and long-term investments at fair value |  | $ 6.4 |
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 | $ 4.7 |  |
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 | $ 1.3 |  |

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