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MARKETABLE SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2019
Cash and Cash Equivalents [Abstract]  
Marketable Securities
The following table summarizes our marketable securities by significant investment categories as of December 31, 2018:

 
Cost Basis
Gross Unrealized Losses
Gross Unrealized Gains
Fair Value
Marketable debt securities (1)
$
25,523

$
(5
)
$
83

$
25,601

Marketable equity securities
1,062

(549
)
947

1,460

Marketable securities
$
26,585

$
(554
)
$
1,030

$
27,061

The following table summarizes our marketable securities by significant investment categories as of September 30, 2019:

 
Cost Basis
Gross Unrealized Losses
Gross Unrealized Gains
Fair Value
Marketable debt securities(1)
$
6,994

$
—

$
64

$
7,058

Marketable equity securities
1,062

(549
)
205

718

Marketable securities
$
8,056

$
(549
)
$
269

$
7,776

(1) Marketable debt securities are comprised primarily of U.S. government notes, and also includes 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
$
6,159

Due in 12 months to two years
899

Due in greater than two years
—

 
$
7,058