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MARKETABLE SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2020
Cash and Cash Equivalents [Abstract]  
Marketable Securities
The following table summarizes our marketable securities by significant investment categories as of March 31, 2020:

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

$
—

$
20

$
2,013

Marketable equity securities
824

(587
)
182

419

Marketable securities
$
2,817

$
(587
)
$
202

$
2,432

(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
$
2,013

Due in 12 months to two years
—

Due in greater than two years
—

 
$
2,013