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Equity and Long-term Investments and Fair Value Measurements - Convertible Promissory Note in Gate Neuroscience (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 02, 2023
Nov. 24, 2021
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Equity Investment              
Additional cash investment         $ 35,689 $ 13,726  
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.          
Additional cash investment $ 5,000            
Equity and long-term investments at fair value     $ 22,100   22,100   $ 15,700
Unrealized loss         $ 600    
Unrealized gain     $ 600 $ 300   $ 100  
Convertible Promissory Note Purchase Agreement | Gate Neuroscience Member              
Equity Investment              
Convertible notes Face Value   $ 15,000          
Debt Instrument, Interest Rate, Effective Percentage   8.00%          
Note Amendment Agreement | Gate Neuroscience Member              
Equity Investment              
Convertible notes Face Value $ 21,500