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MARKETABLE SECURITIES
3 Months Ended
Mar. 31, 2022
Cash and Cash Equivalents [Abstract]  
Marketable Securities MARKETABLE SECURITIES
The following table summarizes our marketable securities by significant investment categories as of March 31, 2022:
 Cost BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable equity securities$756 $(145)$— $611 

The following table summarizes our marketable securities by significant investment categories as of December 31, 2021:
 Cost BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable equity securities$756 $(262)$— $494