INVESTMENTS - By type (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Marketable securities by type
Cost		$ 13,873
Gross Unrealized Gains	$ 0	50
Gross Unrealized Losses	0
Estimated Fair Value	$ 0	13,923
U.S. government agency debt securities
Marketable securities by type
Cost		13,873
Gross Unrealized Gains		50
Estimated Fair Value		$ 13,923