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Financial Instruments and Fair Value Measurements - Convertible Promissory Note in Gate Neuroscience (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2022
Equity Investment |  |  |
Equity and long-term investments | $ 494,097 | $ 483,845 | $ 494,097
Gate Neuroscience Member |  |  |
Equity Investment |  |  |
Number Of Common Stock Issued Description |  | The number of common stock shares to be issued in a qualified event shall be equal to the amount due on the conversion date divided by the lesser of a capped conversion price (the “Capped Conversion Price”) and the qualified event price (the “Qualified Event Price”). The Capped Conversion Price is calculated as $50.0 million divided by the number of shares of common stock outstanding at such time on a fully diluted basis. The Qualified Event Price is the price per share determined by the qualified event. A qualified financing is a sale or series of sales of preferred stock where (i) at least 50 percent of counterparties are not existing shareholders, (ii) net proceeds to Gate are at least $35.0 million, and (iii) the stated or implied equity valuation of Gate is at least $80.0 million. Shadow Preferred means preferred stock having identical rights, preferences and restrictions as the preferred stock that would be issued in a qualified financing. |
Equity and long-term investments | 15,200 | $ 15,100 | 15,200
Unrealized gain from fair value changes in equity investments | $ 300 |  | $ 100
Convertible Promissory Note Purchase Agreement | Gate Neuroscience Member |  |  |
Equity Investment |  |  |
Convertable notes Face Value |  | $ 15,000 |
Debt Instrument, Interest Rate, Effective Percentage |  | 8.00% |

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