MARKETABLE SECURITIES - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Summary of maturities, at par, of marketable securities
2022	$ 11,794	$ 10,180
2023	7,575	750
Total	19,369	10,930
Certificates of deposit
Summary of maturities, at par, of marketable securities
2022	649	400
2023	0	0
Total	649	400
U.S. Treasury and agency notes
Summary of maturities, at par, of marketable securities
2022	3,618	855
2023	1,000	500
Total	4,618	1,355
Corporate notes
Summary of maturities, at par, of marketable securities
2022	7,527	8,925
2023	6,575	250
Total	$ 14,102	$ 9,175