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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]  
Marketable Securities
The following tables summarize 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.

The following tables summarize our marketable securities by significant investment categories as of December 31, 2017:
 
Cost Basis
Gross Unrealized losses
Gross Unrealized gains
Fair Value
Marketable equity securities
$
1,062

—

$
378

$
1,034

Marketable securities
$
1,062

—

$
378

$
1,034
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
$
17,434

Due in 12 months to two years
8,167

 
$
25,601