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MARKETABLE SECURITIES
 3 Months Ended
Mar. 31, 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 March 31, 2019:

 
Cost Basis
Gross Unrealized losses
Gross Unrealized gains
Fair Value
Marketable debt securities(1)
$
16,070

$
—

$
116

$
16,186

Marketable equity securities
948

(571
)
891

1,268

Marketable securities
$
17,018

$
(571
)
$
1,007

$
17,454

(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 three months ended March 31, 2019 and 2018, we did not recognize any significant 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
$
13,051

Due in 12 months to two years
3,135

Due in greater than two years
—

 
$
16,186