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MARKETABLE SECURITIES
 6 Months Ended
Jun. 30, 2019
Cash and Cash Equivalents [Abstract]  
CASH, CASH EQUIVALENTS AND AVALABLE FOR SALE ASSETS

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

 
Cost Basis
Gross Unrealized Losses
Gross Unrealized Gains
Fair Value
Marketable debt securities(1)
$
10,198

$
—

$
98

$
10,296

Marketable equity securities
1,062

(535
)
611

1,138

Marketable securities
$
11,260

$
(535
)
$
709

$
11,434

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

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


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

During the six months ended June 30, 2019 and 2018, we did not recognize any other-than-temporary impairment losses.

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
$
8,893

Due in 12 months to two years
1,403

Due in greater than two years
—

 
$
10,296