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MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2020

Cash and Cash Equivalents [Abstract]

Marketable Securities

The following tables summarize our marketable securities by significant investment categories as of December 31, 2020:

			Cost Basis			Gross Unrealized Losses			Gross Unrealized Gains			Fair Value
Marketable debt securities			$	—		$	—		$	—		$	—
Marketable equity securities			824			(418)			1,841			2,247
Marketable securities			$	824		$	(418)		$	1,841		$	2,247

The following tables summarize our marketable securities by significant investment categories as of December 31, 2019:

			Cost Basis			Gross Unrealized Losses			Gross Unrealized Gains			Fair Value
Marketable debt securities(1)			$	4,171		$	—		$	37		$	4,208
Marketable equity securities			824			(543)			349			630
Marketable securities			$	4,995		$	(543)		$	386		$	4,838

(1)Marketable debt securities are comprised primarily of U.S. government notes, and also includes U.S. government agencies, and tradeable certificates of deposits.

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Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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