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MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2020

Cash and Cash Equivalents [Abstract]

The following table summarizes our marketable securities by significant investment categories as of September 30, 2020:


	Cost Basis		Gross Unrealized Losses		Gross Unrealized Gains		Fair Value
Marketable debt securities(1)	$	493	$	—	$	9	$	502
Marketable equity securities	824		(480)		692		1,036
Marketable securities	$	1,317	$	(480)	$	701	$	1,538

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

The following table summarizes 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

Available-for-sale Debt Securities

The following table summarizes the estimated fair value of our investments in marketable debt securities with stated contractual maturity dates, accounted for as available-for-sale securities and classified by the contractual maturity date of the securities:


Due in less than 12 months	$	502
Due in 12 months to two years	—
Due in greater than two years	—
	$	502