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EQUITY AND LONG-TERM INVESTMENTS AND FAIR VALUE MEASUREMENTS - Convertible Promissory Note in Gate Neurosciences (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 06, 2023 | Feb. 02, 2023 | Nov. 24, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity Investment |  |  |  |  |  |
Additional cash investment |  |  |  | $ 1,218 | $ 13,725 | $ 6,373
Gate Neurosciences 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. |  |  |
Additional cash investment | $ 5,000 | $ 5,000 |  |  |  |
Equity and long-term investments at fair value |  |  |  | 28,000 | $ 15,700 |
Unrealized gain from fair value changes in equity investments |  |  |  |  |  | 600
Unrealized loss from fair value changes in equity investments |  |  |  | $ 400 |  | $ 800
Convertible Promissory Note Purchase Agreement | Gate Neurosciences Member |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Debt Instrument, Principal Payment |  |  | $ 15,000 |  |  |
Debt Instrument, annual interest rate |  |  | 8.00% |  |  |
Convertible notes Face Value |  | 21,500 | $ 15,000 |  |  |
Note Amendment Agreement | Gate Neurosciences Member |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Convertible notes Face Value |  | $ 21,500 |  |  |  |
Second Note Amendment Agreement | Gate Neurosciences Member |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Convertible notes Face Value | $ 27,700 |  |  |  |  |

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