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MARKETABLE SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2020
Cash and Cash Equivalents [Abstract]  
Marketable Securities
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


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

 
Cost Basis
Gross Unrealized Losses
Gross Unrealized Gains
Fair Value
Marketable debt securities(1)
$
993

$
—

$
14

$
1,007

Marketable equity securities
824

(580
)
431

675

Marketable securities
$
1,817

$
(580
)
$
445

$
1,682

(1) Marketable debt securities are comprised primarily of U.S. government notes, and also include U.S. government agencies and tradeable certificates of deposits.
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
$
1,007

Due in 12 months to two years
—

Due in greater than two years
—

 
$
1,007