FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Convertible Promissory Note in Gate Neurosciences (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 24, 2021	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
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 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.
Long-term Investments		$ 483,845	$ 438,258
Gate Neuroscience [Member]
Debt Instrument [Line Items]
Debt Instrument Transaction Cost		900
Unrealized loss from fair value changes in equity investments		800
Long-term Investments		$ 15,900
Gate Neuroscience [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	8.00%
Convertible Promissory Note Purchase Agreement [Member] | Gate Neuroscience [Member]
Debt Instrument [Line Items]
Debt Instrument, Principal Payment	$ 15,000