MARKETABLE SECURITIES - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Summary of maturities, at par, of marketable securities
2022	$ 9,329	$ 10,180
2023	17,970	750
Total	27,299	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	3,003	855
2023	5,500	500
Total	8,503	1,355
Corporate notes
Summary of maturities, at par, of marketable securities
2022	5,527	8,925
2023	12,470	250
Total	17,997	$ 9,175
Municipal notes
Summary of maturities, at par, of marketable securities
2022	150
2023	0
Total	$ 150